. Flatulence. To pass gas.
Jim went over to hit on that girl at the bar, but as he opened his mouth, he felt he was about to bust a move, so he kept walking to the patio outside.
A contraction of "issues internalized" - "sues in." Used to connote that a person is surpressing a lot of emotional baggage.
Ever since the divorce and her brother's death, Emmily has a lot of susans.