Motions that are sudden, involuntary, sharp movements in response to agitation or stimulation. See flinch for similar motions in response to surprise or shock.
Use for momentary motions, not for sustained motions like shivering or trembling.Denoted by jagged motion lines.
For the website, see Twitch.
twitching bulgetwitching penistwitching pussytwitching testicles
The Free Dictionary