(informal) To become explosively angry; to lose one's temper. / (informal) To feel devastated, or distraught, especially when one's sadness is overwhelming. / (informal) To begin to laugh uncontrollably.

The trigger finger of a person eager to fire their weapon or likely to do so unexpectedly.

(idiomatic) To enjoy oneself, to have fun.

(colloquial, rhetorical question) Am I the only one who thinks this?

Alternative spelling of gin and it

A simple cocktail, similar to an unsophisticated martini, made from gin and sweet vermouth

(figuratively, idiomatic) To put one's foot in one's mouth.

One is never too old to change one's ways; learning is always possible.

Misspelling of itself.

Third-person singular simple present indicative form of take it up the ass