Top definition
Someone who makes your bits twitch.

"Bits" being your nether regions, with the twitching referring to sexual attraction.

Mostly used by women when they come across an insanely buff guy.
Shaunna: Check out that guy over there.
Heather: He's pretty hot, makes my bits twitch.
Shaunna: Definitely a bit twitcher.
by Female Human June 10, 2016
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