If something unlucky, ridiculous, incredible, etc were to happen, you yell this. The number of times you say "dirtay" determines how bad the event was (ex: 10 dirtays is very bad)
a lifestyle involving sending all nighters and pulling benders. popular on hats. if one reps the dirty goose then they will out party anyone present at said party.
yo did you that guy wearing the dirty goose
hat.
yeah he slammed the whole half gallon of black out water like it was nothing.