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SITFU, short for Suck It The Fuck Up. Commonly used by men towards whining women or other men that are whining. Used by military members towards other military members that are whining.
The Sgt told the Gunny that his head hurts from his old lady beating him with a baseball bat. The Gunny tells him to go to medical, and get some SITFU to make it better. The Sgt asks, "what's SITFU"? The Gunny says, "SUCK IT THE FUCK UP"!!!!!
SITFU by Company Gunny April 14, 2007
Related Words
SITF sitfacious sitfc SITFTWL SITFU sitfuck SITFUDO
having sex while sitting down
Did you see that shit they were sitfucking while I was eating my sandwhich.
sitfuck by Matt June 17, 2006
Shiting In The Fucking Toilet While Laughing
OHH meen i´m totally SITFTWL!! jajajajajaja
SITFTWL by DANIELOUPS June 29, 2011

sitfacious 

A feeling of when one cannot deny the urge to sit on another ones face whilst presenting ones genitalia.
"Hotstuff over there's got me feeling all sitfacious, might need a wet floor sign over here"
sitfacious by K den. August 6, 2014
Military Acrnoym for "Suck It The Fuck Up, Drive On"
Joe 1: Man I only got like three hours of sleep last night and was last in line for chow

Joe 2: Man, you need to SITFUDO.
SITFUDO by SLCC74 July 28, 2011
“Sitfc now!”
Ok!”
sitfc by Hehemichaljackson May 18, 2021