Merhaba,

I don´t understand why sometimes my friend write : ben gelicem or ben gidicem or ben yaticam....

For me normally it is : ben geliyorum or ben gidiyorum or ben yatiyorum.

Can you explain me ?

Tesekkur ederim !

there are just shortened versıons of geleceğim gideceğim yatıcağım

I wıll come

I wıll go

I wıll sleep

Tesekkur ederim !

geleceğim>gelecem>gelcem

yapıyorum>yapıyom

ne haber> n´aber

ne ediyorsun>nîdiyoñ or neediyon

...

these are used cus it´s easy to pronounce.

The shortest form --->  -cem/cam  is shortened version of future tense ending for 1st singular -eceğim/acağım, it is used because of laziness and for the sake of quick talk by dropping couple of letters.

-cem [cam]----> eceğim

-cen [can] ----> eceksin

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- cez [caz] ----> cağız

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giyin + cem = giyineceğim ----------> "I will get dressed"

                                                      " I am going to get dressed"

Would gelecem be considered slang? gelcem?

I don’t think it’s slang, because they are not impolite or rude and it doesn’t belong to any group in particular. It’s just ‘lazy’. It’s like ‘gimme’, or ‘gonna’ or ‘dunno’. ‘Geleceğim’ pronounced fast becomes ‘gelecem’.