A bastardization of the word mustard, for people who like to garnish their burgers and dogs and swear at the same time. Goes well with katshit.
Joe: All this burger needs is a little mouseturd ... mebbe some katshit too.
Celia: <sigh> Can't you say anything without fucking swearing for once?!
Joe: <rolls his eyes> Tse, I'm just kidding, for fuck's sake!
A retarded epileptic goose that has the most spasticated fits while playing guitar in front of an audience. The fits occur mostly when he is playing his clever very own composed solo, 10 12. He dances around in the spotlight as if he's the leader of the band he's in. What a spacker!