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When you have had too much to drink and you bang on the wrong person's door.

A spin-off of "Party Knocking" made famous by LMFAO..."Sorry for Party Rocking"
"Hey guy in apartment #3, sorry for party knocking last night. I had a lot to drink and thought you were someone else's apartment!"

"Sorry for party knocking"
by NYRobbies April 04, 2012