someone who is a twat and has a spastic moment
cat is a twastic!!! "god cat you twastic!!"
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the act of getting a fucked up sex change that goes completely wrong, and you end up with a twat and a testicular gland so you now have a vagina and a cumming magazine but no glue gun.
That islamic guy has a twastical hanging from his pants of and you can just see the camel toe has a testicle shape to it while he sings Numa Numa song
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A combination of twat and spastic, usually referred to a person or persons of any gender, who is being retarded, arrogant and just a twatty spastic.
"Oh my god, Briony is a twastic".