Hi, I frequently read this sort of sayings in Turkish social sites:
"bir ömür seninleyim derken hangi hayvandın? kelebek mi?".
"Seni ölene dek seviyorum derken hangi hayvandin? Kelebek mi?".

Is it part of a poem, proverb, funny saying, or a romantic context?
I understand it partially, but I´d like to know thw actual meaning behind it. 

Regards,
Scott 

MyTry:

Which animal were you while saying I´ll spend a lifetime with you? A butterfly?

Which aminal were you while saying I will love you till I die? A butterfly?

(Referring to the short life of a butterfly. The context is smart aleck.)