to tell them after your done beefing with one person they are next
yo after im done with your boy im going to see you on the sidelines
by chris January 12, 2005
1 more definition
To sneak up behind someone in the bathroom and devilishly ass ram them as they are bending over to lay down Toilet paper.
Yo did you hear how Jessie sidelined that kid during intermission of the Celine Dion concert?
by Potapenko November 06, 2006