I SAT IN GUM!?
This is the action of displaying a small area of your scrotum and exclaming "iew I sat in gum" as if your scrotum was a piece of gum.
During class:
Mr. Jones: "So let's take it again from the--"
Student: "Iew Mr. Jones I sat in a little bitta gum!"
Mr. Jones: "So let's take it again from the--"
Student: "Iew Mr. Jones I sat in a little bitta gum!"