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 7, 2006
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Basically When Someone's Trying To Have An A & B Conversation & C Comes Along And Decides To Be In Their Business.
Aaliyah : Have You Seen The BET Awards
Drewanna : Yeah , Nicki Looked On Point
Sharleen : Nicki Looked Like A Hoe
Aaliyah : Mind Your Business , Youre Always In The Sidelines
by SharXvi November 3, 2015
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when ur friend tells u deep shit on why his weird infatuation with his crush wouldn't work out and on the verge of a mental breakdown, but he tells you to go home so that he can comfort his crush. So you go the nearest train station have continue ur mental breakdown.
so you thought he was ur friend but he sidelined u huh?
by stalkerjoe October 7, 2020
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when ur friend tells u deep shit on why his weird infatuation with his crush wouldn't work out and on the verge of a mental breakdown, but he tells you to go home so that he can comfort his crush. So you go the nearest train station have continue ur mental breakdown.
so you thought he was ur friend but he sidelined u huh?
by stalkerjoe October 7, 2020
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"Sidelines" is also a band from South east London from England, UK. They are a heavy metal/rock band
Person1: what are you listening to?
Person2: Sidelines
Person1: never heard of them
Person2: that's because they aren't popular
by JoshWoody2 August 16, 2019
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to be exchanging n*des but they are talking long so you watch p*rn to keep you going
1.she was taking so long to send man

2.what did you do
3.i was on sidelines, i got bored
by manthony44 December 27, 2021
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When a bro has no interest in a female due to his bro's past or present feelings for her.
Bro: Yo, you into that girl?
Bro #2: Nah dude, she's been bro-sidelined cause of Bro #3.
Bro: Shit man, I didn't know, I'll ease off then.
Bro #3: Thanks bros.
by TheWiggityWackOne April 24, 2013
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