1. Statement or command used to signify the beginning of an action or event immediately, without further delay. May be used in a positive or negative connotation.
2. see also: get it on
"Hey! You wanna beef motherfucker?!"
"Allright sucka, let's do this."
a urban term used when about to accomplish somethingimportant or worthwhile. Usually used proceeding a violent act.
E.I. In the movie "Menace To Society"..
ODogg: Kane,I heard where them niggas that shot ya cousin hang at... ya down for a 187? (Murder)
Kane: "Let's do this".
ODogg: You gettin down my nigga.
Origin: The "Monster Truck" Strong Bad email wherein Strong Mad will smash Marzipan's guitar over Homestar's head. Homestar says "Let's do this like Brutus!"