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A fake friend who secretly wishes you to fail at everything.
Since my friend Jon secretly wanted me to get my ass beat in a fight, he was being a sideline hater.
by Night_Nite May 26, 2014
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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
via giphy
by ecogoth December 30, 2020
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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 05, 2014
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