oosp

Basically, the term "oops" mispelt by typing inaccuracy. Soon thereafter being given the definition of "underarm fat". Most commonly seen on elderly substitute teachers.

Substitue teacher: Good afternoon class. I'm Mr's henline, your substitue teacher.

As she proceeds to write her name on the blackboard...

Me: dude, do you see the oosp hanging off her arm? Fuckin' gross...