A combination of a twitch and a spasm.
Dude, your dog is having a twism.
Twism is when the prefix "tw" is added to a word that has been created, or coined out of the growing use of twitter
and the nomanclature that is being created.
's lame record label, an acronym
for "The World Is Mine".
Also, what you yell out when you jump up and hang on a lowered rim in the gym, or maybe even the occasional doorframe lintel. Be sure to slap the backboard/wall before landing for full Shaq-ish goodness.
TWIsM records went out of business, which should come as no surprise to anyone who has heard Shaq rap.
When Brandon TWIsM-ed on that double-door's frame, he broke the spring mechanism clean off and had to run away from the vice-principal to avoid being caught.