look up any word, like sapiosexual:
 
1.
Another term for tits
Check out those fat jacks! I'd hit it.
by JL3 August 14, 2005
 
2.
Sexual attacks or advances by a large person.
"Yo, Kalen got fat-jacked at lunch."

"Yeah that fat girl was all up on him."
by HaxNick February 09, 2009
 
3.
a person who is just jacked up.. totally messed up
and the person is a fag because they are that.. messed up i guess
MAN.. HE JUST STOLE MY MUFCKIN PENCIL.. WHAT A FATJACK
by Kennth Amawa March 15, 2010