When one holds in a fart (squeeze the butt cheeks); often times to avoid embarrassment.
If your hold in fails you must result to a ghost fart
I was in school holding in all day, then finally I unloaded my explosion at home.
A crazy and often delirious person. The term was popularized by Grandpa Phil in the 90s cartoon Hey Arnold.
Oh, simmer down, You hot headed loony!