Humorous phrase used to typically describe someone who enjoys lifting up the shirt of a shirt-wearer. Usually used to describe a homosexual man who does indeed lift up the shirt of a guy just before slipping his penis up the rectum of said guy, or just before taking another man's organ into his mouth.
E.g A man drops his pants to reveal his member, but just before receiving a gobble from the gobbler his shirt would need to be lifted up, or even better removed entirely.
"Deontay been spending a lot of time at those fruity male only bars, he must be a serial shirt-lifter that really loves cock!"
It's that nervous habit some people have when they stretch their shirt out over their knees. Usually results in one of your parents scolding you for stretching out the fabric
Zach: "Ryan! Stop making a shirt-hut! You'll damage the fabric!"
Ryan: "But I've got a big programming exam tomorrow and it's a nervous habit. Please don't get out the belt Zach!"
the part of the shirt located just below the chin one uses to filter foul odors, instinctually used when in uncleanly bathrooms, or after a destructive passing of gas(fart, chemical attack)
1.Duuude.. that truck stop restroom was so narsty i had to use my shirt mask just to take a piss.
2.that fart was so pungent that my shirt mask was the only protection i had