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A gallow fuck is a lying bastard who flirts with you while being a total cocky prick, and they might even look good while doing it.
My ex was a gallow fuck. He promised me a future, then got a new girlfriend and forgot me.
That guy at the bar was a gallow fuck. He said he'd buy me a drink, then just stared at me like I was his next meal.
My best friend's crush is a gallow fuck. He told her he'd ask her to prom, then asked her to prom with a text and a meme.