A muzzle loader is when you are doing a chick from behind and then pull out and put your dip in her pussy and keep going.
Jameel: I did the muzzle loader to a chick yesterday.

Brent: You fucker. you wasted dip on that cunt.
by jzee August 20, 2007
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When you grab a 2 liter of mountain dew, put in your fat girlfriends asshole and empty it in there. Then you tongue punch her fart box and drink the dew out the booty hole.
Gave my lady a McMurdo muzzle loader last night, she said it was the best time of her life!
by Mikeoffdayike March 2, 2021
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Essentially, it's when your bangin a girl/man from behind with a dip in (preferably grizzly wintergreen). At the discretion of the banger, take the dip out and shove it in the girl/guys anus. Next shove your dick in the ass, thus muzzle loading. If done correctly, the bangee should receive a buzz via the inferior rectal branch of the pudendal artery.
Wow Michael, I'm literally buzzing my ass off! That was so much better than last time you gave me the Grizzly Muzzle loader!
by J Cobb December 12, 2010
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When you are banging a chick in the doggy style and then you put Dunkin’ Donuts coffee ground on her asshole and jam it in with your dick.
“Dude, when I railed this broad last night, I gave her the ol’ Boston muzzle loader!”
by Cheddar_411 May 28, 2019
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