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.)
When Rudy Giuliani placed both his hands around his genitals while laying on his back in a private hotel room with a woman playing a 15 year old but not that time he was at Jeffrey Epstein’s postjail release party.
Don’t believe you’re lying eyes! I was tucking in my shirt!