Allie-ing occurs when your significant other hits on and subsequently dates somebody else, therefore ditching you for the other person. Said romances often start by casual and friendly texts, internet conversations, or phone conversations and progress to pain and rejection.
"Are you still going out with Tonya??" "No man, that whore has one boyfriend a week!!! When I broke up with her she was Allie-ing some bi dude."
by SYTW September 17, 2008
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