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1.
urinating myself laughing

a nicer way of saying the well known phrase pmsl, pishing myself laughing. you can use this when you find something funny. like when someone does something stupid. or you see somone extremely ugly!
dogface just fell. umsl mate umsl
by ST&CW April 19, 2010
 
2.
The University of Missouri-St. Louis. ("uhm-zul")

A four-year university on the outskirts of St. Louis, Missouri. (It's really in *Normandy* - a town in St. Louis County)
"UMSL's parking is soooo expensive!!!"

"I transferred to UMSL from community college."

"I dropped out of UMSL because I only went to class when there was an exam."
by diet_electron_girl September 02, 2006