Some slang words you might hear from your Turkish Friends. And they might sound rude to other people though. 

Tüymek  -    to leg it  [ to run away ]

Beni görünce  tüydü --> He legged it  when he saw me.

                                    He  run away  when he saw me.

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beleş -  free  [ something you get free, without working for it. ] its not very polite word, but some people likes getting things without working for it.

 And we call  those type of people  as  " beleşçi " = one who lives at the expense of others, one who wants things for free.

  * Alternative to this word would be  " bedavacı "

* this word, etymologically, comes from arabic, 

bozuk  çalmak  - looking like  bored,  displeased., angry, having sullen face.

Bugün  bozuk  çalıyorsun ---> You act [look] like  angry , bored and displeased today.

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bitmek  - This action may used in slang and can mean " to like something or someone so much that  going mad about it or that person.

 O arabaya bittim. ---> I liked that car so much .

note that this is slang and and might be considered as rude expression by other people. 

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Can I add some more Tunci Hocam?

ayar olmak - to be pissed off, to get pissed off

Onun bu sözlerine ayar oldum - I got pissed off with his words

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ineklemek - to study hard, to pound books

Sınavdan önce 3 gün inekledim - I pounded books for 3 days before the exam.

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(okulu) asmak - to skip (school)

Yarın beraber okulu asalım - Let´s skip the school tomorrow

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nalları dikmek - to die, to kick the bucket, to bite the dust

Dikkat et yoksa nalları dikersin - Be careful or you´ll kick the bucket

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zokayı yutmak - to take the bait, to fall for a trick, to be deceived

Adam bize zokayı yutturdu - The guy made us take the bait

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geyik yapmak - to chit chat, to shoot the breeze

Arkadaşlarla geyik yapıyoruz - We are shooting the breeze with friends

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boynuzlamak - to cheat (in a relationship)

Karısı bu adamı boynuzlamış - His wife cheated on this man

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kafayı yemek - to go crazy, to go nuts, to be out of one´s mind

Niye böyle davranıyor? Kafayı mı yedi bu? - Why is he behaving like that? Has he lost his mind?

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ayvayı yemek - to be in trouble

Şimdi ayvayı yediler - Now they´re in trouble

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gıcık etmek - to irritate, to annoy

Şu adam beni gıcık ediyor - That man is irritating me

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filinta gibi - handsome

Şu çocuğa bak, filinta gibi - Look at that boy, he´s handsome

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taş gibi - sexy, beautiful

Şu kıza bak, taş gibi - Look at that girl, she´s sexy

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aval aval bakmak - to gawp, to look stupidly

Aval aval bakma, bir şeyler yap - Don´t gawp, do something

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saksı - head

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saksıyı çalıştırmak - to use one´s head, to think

Aval aval bakma, saksıyı çalıştır! - Don´t look stupidly, use your head!

( enough for today)

Thanks Faruk Hocam, they are very useful, I reckon learners will enjoy learning and talking Turkish slang words     as  we all using them time to time..