Means to have to defecate or have a bowel movement or to have to take a dump. Mainly used for an emergency situation, where the movement in imminent, but can be used for any announcement of your condition.
Remember that jalepeno burrito I had earlier, with the ice cream sundae and Heinekins for dessert? Well, Mr Hankey is knocking on the door about now!!

I've been sick all day, and I think Mr Hankey is knocking on the door again.
by PALABRAMAN July 17, 2009
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When your dick is so big that the head repeatedly bounces off the cervix during intercourse.
"Yo Leish, remember Tyrone that boi i I had ova last nite!?!

"U kno it girl, wha he do?"

"Gurl his dick so big he be knocking on heaven's door all night kno whA am sayin?"

"Shit guerrrlll"
by Fadiastheonlyone August 23, 2016
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some black guy that comes knocking on your door.
dude nigger knocking on my door ,piss off.
dude, there is a nigger knocking on my door
by xTHE_WOLV3x September 25, 2018
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Pressing the tip of one's erect penis against a woman's anus in the hope that she'll agree to anal sex. This technique is futile 99.753% of the time, but persists due to the collective male delusion that women secretly love to be invaded in this way.
Boyfriend: (knocking on the back door)

Girlfriend: How many times do I have to tell you??? Get that thing away from there!!!
by Carl Pinkerton May 16, 2009
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When someone with a hard on grinds it against your ass while dancing, cuddling, spooning, or just standing behind you.
Tanya loved spooning but hated when her boyfriend used it as an excuse to go knocking at the back door all night.

“That guy at the bar was cute but he was knocking at the back door all night on the dance floor and that’s why I didn’t go home with him. Why bring someone home if you know he’s just packing half a roll of Life Savers in his pants?”
by Brett Burkhardt April 27, 2008
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When a man feigns an attempt at anal penetration in order to startle his partner.
Woman: I told you I don't do that!

Man: Don't worry, I'm just knocking on the back door.
by wiggy_G November 21, 2009
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