Derogative term, used to describe an individual (often a male) who is indecisive, unwelcome, or in any way socially awkward; comparable to calling someone a "wanker."
What, you STILL don't know what if you want pepperoni or cheese pizza? Bruh, like...don't be such a hand-bender.
Is that Eric? God, what a hand-bender; let's bounce, yo.