A friend that is well liked by friends but doesn't get asked to hangout or get invited to things and is left on the "sidelines"
She says she likes me but never wants to hangout with me, I feel like a sideline friend.
by bigred00 December 25, 2015
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"My God, after sexing Mandy, Jake went home to his wife; Guess she's his new sideline ho."
by Aidenne February 21, 2007
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A female who is in a realionship with a fella that has one more main bitches..... however the sideline gets to ream all the benefits of a realionship..such as.. dates..public appearances..gifts...bills paid..spontaneous sex..without having to answer amy questions or go thru drama.
Sideline bitch..gets to have all the fun..
by UAS November 12, 2013
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You're the friend that can never make it to events and you often watch your best friends fall in love leaving you for a third wheel position. Then when they break-up, you're caught in the middle of friendships usually making you chose a friend over the other. You've lost a majority of your friends because they either moved or you lost contact with them. You're actually lonely although you have plenty of friends. You're not really open and you fear to lose your best friends or you don't want to get close and then lose them. So now you just watch from the sideline as sort of a cheerleader. You're close enough to be supportive and far enough to watch everything being played out and find your position among your friends. In all honesty, you want the hugs, hangout days, birthday parties, and movies days. But you don't want to deal with the emotions of losing them either to death or a break-off. You don't like taking risks in relationships which most likely is the reason you're single. A lot of girls/guys like you and you even have one person desperately wanting to be with you. But from you first Crush/Relationship you learned a hard lesson of following your head and not your heart. So From the sidelines, you will watch until the opportunity comes, as the Cheerleader.
I love my best friends but I can never make it to their performances. I hate being one the sidelines but ig I gotta stay.

Her and zack are back together now, time to get new friends I guess.#Sideline Friend
Okay...they both told me the problems they had with each other and how bad it is to be friends with them. #Sideline Friend
by Ryan Jay Jone February 23, 2018
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The "Sideline Girl" means the girl who is always with you to attract, control, propose and to talk. Means she is like BFF to the boy crush.
I look her like BFF and she looks me like I'm her crush which means she is sideline girl.
by D3VR4J June 30, 2018
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A person who remains sober throughout a party/night out. They keep at the "sidelines" and are not at all party goers.
Look at that kid sitting in the corner. He's drinking Mountain Dew. He's such a Sideline Sober!
by Pre-Smashers November 4, 2010
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Someone who uses you and likes to see you fail in life, school, or even your job. A big prick, honestly. He maybe uses you to see your information or something that you own such as a game, car, or maybe even your own house. He in the end reveals he is your hater. You then succeed in kicking the prick in the nose and breaking a bone.
Dang, Manuel's best friend is a sideline hater, that's just a shame

Josh used to be friends with Garrett until he found out Garrett was a sideline hater using him for money, fame, and games. That's super lame.
by Ultraf0xDictionary June 5, 2014
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