It has nothing to do with UT. Onslaught is when you are a savage and go in beast mode and bring the damage. Onslaught is when you are in the act of slaughtering someone at something. IE. fighting, fucking, gaming etc.
Man that bitch thought he was gonna win but I brought the onslaught and threw a vertical 360 cockslap with my lumber and broke his jaw.
We was boxin and i went in beast mode and brought the onslaught and got a K.O.
Man I got me some tight pussy last night, son it was a onslaught.