The act of having vaginal/anal sex with a partner and using your semi-erect penis (ram rod) to shove your testicles (ammunition) in the desired orpheus (muzzle) like that of a muzzle loading rifle. (Once your testicles are in the desired hole, you may also put your penis in the unoccupied hole if you so wish.)
"Bro! Last night I totally gave this haggard chick the Muzzle Loader in my car! I wasn't shooting blanks either!
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When you drink/chug a 12 pack of beer and have your friend punch you in the face so you can fall asleep.
"Jethro! Run over there and give your pappy an Arkansas Sleeping Pill so he'll shut the fuck up!"