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1.
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!
by ocius1 April 06, 2009
 
2.
The gunk that accretes on the bottom of a computer mouse.
Argh, my computer pointer is jumping all over the place.

Try cleaning off the mouse turds.
by col.panik June 15, 2011