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The act of failing to recall what to do during sexual activity.
"I just pulled a Grinder" said Alice after forgetting what to do, penis in hand.
Grinder by NannyMcPhee May 26, 2009
A girl who grinds her teeth alone the shaft of a man's penis.
That chick was a grinder, so I gave her a purple mushroom...see purple mushroom for details.
grinder by Evan Met January 14, 2006
describing a girl that you would grind your dick into like putting meat into a grinder.
She is such a grinder!
grinder by Lance Mitchell August 8, 2003
The Grinder- First discovered on a Doom 3 demo, is the god of all grinding machines. It is basically a cylindrical pit with a catwalk just overtop of it. Only half of the pit is visible, as the other half is covered (it is a rather shallow pit). This cylindrical hole in the floor has two rotating arms of great mass that rotate at sonic velocities from the center, sort of like a misshapen giant food processor. Countless monsters can be spawned in the grinder only to see the arm sweep them underneath the covered section, and the same arm emerging with nothing but a bloodstain.

The grinder, after being discovered, became the primary method of producing Noobioes, The Breakfast Of Champions. The process is simple- all the noobs of the world are captured in their gaming sessions and MS-DOS prompt "hacking" sessions and are thrown simultaneously. When the grinder is turned on, all the noobs become something like ground beef, and they are then removed and turned into little 'O' shaped cereals. The grinder is truly an amazing device that is not to be taken lightly - however, if wrenches or chairs are mistakenly thrown into the grinder, jamming and lag are sure to ensue- so be careful on the types of noobs that are thrown into the grinder.
"I heard Gerald got turned into noobioes"
"How did that happen"
"Simple, he was thrown into the grinder on the Doom 3 demo."
"Well, he has been turned into something useful! The breakfast of champions!"
Grinder by Carson Myers August 1, 2007
device used to make illicit substances easier to enter in to the blood stream
put those rocks into my grinder
grinder by bling December 1, 2003
A type of boomer in Gears of War2, using a heavy machine gun. They are tough to take down when they outnumber you.
Grinder! Get Down!
Grinder by TheArbiter17 November 30, 2010