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1.
The section of a tool/device directly responsible for producing the desired effect of that tool/device.

Generally used in the context of a threat, occasionally in a sexual scenario.
"You don't wanna be on the business end of my gat, son."

"I'm gonna introduce that ho to the business end of my cock."
by Cracker2000 August 23, 2004
 
2.
The section of a tool/device directly responsible for producing the desired effect of that tool/device.

With females in a sexual connotation this means the bottom half of her torso, roughly the area between her belly and her knees.
- "Don't let you be distracted by her shitty face. Her business end will do just fine for your daily activities"

- "Watching a girl on all fours from behind gives you the perfect opportunity to admire her business end"
by dutchpantyraider April 02, 2014
 
3.
The end that produces fecial matter, or "business" as you may call it.
The business end of your girlfriend is friendly with the arserapist.
by Kung-Fu Jesus April 20, 2004
 
4.
"Oh, it's raining after all"
"Thanks for voting for me, now please piss off" (the "business end" of a politician)
"I am holy, you are not; and this is the "BUSINESS END" of a vicar. Piss off."
by nothing to do with it October 28, 2003