Origins:
This term originates from Batman's Harley Quinn, who first appeared in Batman the animated series and gained so much popularity that she was placed into the comic books.

Meaning:
When a character which originates from a cartoon gets placed into the comic books, or becomes canon.

The most effective way to turn gasoline into noise without producing any horsepower

The jokers girlfriend/sidekick and one of the smartest, most bad, and hottest batman super villains whom actually killed boy wonder (robin) and uses her street smarts to get by

Release of flatulence that sounds akin to a Harley Davidson motorcycle engine revving.

also known as fat cunt, he spends his day's eating fatty food and sucking dick.He has nor mate and has the record of using 60 GB of data in half an hour.

Harley is a strong yet sweet boy who grabs the hearts of many. He has a way of making you feel safe and has a way of protecting you. Only is nice to the people he likes and can be very popular. Normally goes out with blondes and names beginning with J some of his best friends names begin with N or E. Can make you laugh EASILY and many girls LoVE him! But he is loyal to one girl normally blonde and the name beginning with J he has normally blonde hair and blue or brown eyes very strong guy

when you tie someone to the floor, then poop on their chest and head