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After fiercely pursuing and fantasizing about a potential love interest, bud zoning is the act of relegating said fantasy into a "friend" and no longer being able to picture them as an object of sexual desire.

Bud zoned is the word to refer to a guy that is no longer a sexual interest to a female pursuant.
Friend: "How did your date go?"

Tina: "I can't picture kissing him!"

*Friends make eye contact."

Friend: "Bud zoned!"
by XXXTina October 16, 2012