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2.
Tucking (or tuckin' depending on your Ghetto Level) means to be packing heat.
Dude #1: "Yo boyz go grab tha gats them fucka's be tuckin'"

Dude #2(different situation different dude): "Oooh no you didn't! Like Oh Mi Gawd, you better get out of my face because my boifriend is totally tucking!" (yes... this dude happened to be gay and have an unusually low Ghetto Level.)
by a dude who has hair September 08, 2004
 
1.
the act of a man taking his penis and hiding it bewteen his thighs in order to create the illusion of female genitals
Oh, shit!I thought you were a chick, but you were just tucking!
by meowza May 02, 2005
 
3.
when a person wakes up with hangover and trys to hide it
"hey man you dont look so good. are you tucking?"
by KCMO November 12, 2007