What is Dejafuck?
1.
Fucking someone you've fucked before, but don't remember fucking.
I think I had a dejafuck last night.
See
2.
:from sex and the city. When midfuck you realize you have done this person before
I had a dejafuck last night...
3.
being intimate with someone who you were intimate with in the past
last night i had dejafuck with johnny