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An individual who is not currently fat, but likely will be in the future, particularly after they age, bear (a) child(ren) or stop working out 3 times a day and start eating because they get married and thus tie their man down.

Often prefat is used as a derogatory comment, and with consideration not just of one's physical appearance but also their personality.
That whore at work may look decent now but she's prefat. Giver her 3 years, will be round as a ball.

Christy better be careful; I heard her say she want's a big family but you know she prefat. Those pounds aren't coming off after she pops a kid.
prefat by j_w_c October 24, 2010

precautionary wizz 

the act of heading to the bathroom even if you do not feel the need in order to ensure you can devote your full attention to an upcoming activity
Before heading out to golf, Paul took a precautionary wizz .
"Prefunc" is an abbreviation referencing the longer phrase "pre-function."
It is often misspelled as Prefunk, due to the ambiguity of the spoken word.

All of these terms refer to the gathering and happenings that come before a main event.
"Tonight we're going to prefunc at Jim's before the concert."
Prefunc by Jenny Chinchilla August 6, 2008

Precautionary Pepto 

A Pepto-Bismol taken prior to a date, party, or other important social function in order to prevent any bowel-related mishaps during the event.
1. I wish I hadn't had Panda Express for lunch. I need a Precautionary Pepto before I hang out with Bridget or else I'm gonna get the runs.

prefanity 

Coined by Penny Arcade, prefanity are words and expressions which are not yet considered profanity, but will at some point in the future become vulgar.
"That guy who just killed me in Halo is a real ham doctor"

"What's a ham doctor?"

"It's prefanity, dude. Trust me, soon it will be a worse insult than cuntburglar - just wait and see"
prefanity by sick_puppy July 22, 2009

prefuse 73 

prefuse 73 is the shit
prefuse 73 by dubpl8s January 6, 2004