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1. noun: A bag full of faecal matter, otherwise referred to as "shit"
2. adjective: Used to describe something so bad that the adjectives piece of shit or merely shit no longer suffice to describe its inherent shitiness.
3. Adverb

Sometimes hyphenated, said as one word.
"Avril Lavigne is a bag of shit."

"They performed bag of shittily.
by Moses50a November 14, 2006