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when a person suddenly changes their behavior towards you for the worst.
Aw man, I used to fuck with her heavy but she switched up.
by lightbrownsugar May 12, 2016
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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2
When you used to be close with someone and now you're not because they're not who they try to appear to be.They've given you a reason to change up your whole attitude and perspective.You were friends with them and kind of low and now you've become your own and you're on top.
Kim K switched up after she left Paris Hilton's entourage.
by Whatactuallyhappened March 08, 2016
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