a) the act of specifically raping a virgin teen girl in the anus

b) arriving somewhere unexpectedly, when they least expect you.
sociologist of criminal behavior, (visiting the cemetery of Marion State Prison, Illinois): Ghost Poinsalet, I hear you are famous, even among ghosts, in this cemetery. What have you been incarcerated, and executed for, 27 years ago?

ghost of Matthew Poinsalet (character from Dead Man Walking): Sir, it was for knocking at your back door, definition b), to the house of 2 virgin teen girls, then committing knocking at your back door, definition a), and then finally murdering my victims.

sociologist (under his breath): How atrocious, may we condemn all child rapists and murderers to the electric chair, Amen.
by Sexydimma June 1, 2015
Get the knocking at your back door mug.
It is an old irish saying meaning to be fed well enough to become fat. Ex: Your sides are fat enough to cover your backbone.
Man: Aye lad, have ye got your sides o'er your back yet?
Boy: Yes sir I have eaten my fill.
by Veritazium May 6, 2021
Get the Sides o'er your back mug.
People are diverse and their preferences are correspondingly diverse. Some might like sports cars and watches or other tech gadgets etc.
Bill: Hey, did see that new Seiko 5 watch that came out yesterday?
Rudolph: No, I'm not a fan of watches.
Bill: Dude, it's one of the best entry watches right now. I'm definitely getting one.
Rudolph: Whatever blows your hair back, dude. Like I told you, I'm not a fan of watches.
by liprox May 14, 2022
Get the Whatever blows your hair back mug.