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31.
noun and verb poop

from a misreading of "to kill a mockingbird" when they poke under the bed with a broom handle. a grunt under the bed.
A. hey, cover for me, i'm on cigarette break!
B. huh uh. you just had one.
A. yeah, i know. i didnt want to say, i'm actually going to do a grunt.

oooh, did you see that nasty grunt in the shitter? it didnt flush!
by dr. roland james nesbaum III October 18, 2005
 
15.
A person at the lowest level of anything.
We are all just friggin' grunts her at this office.
by Jimmy Staycox August 03, 2003
 
16.
Term of affection for that tired, filthy, thirsty, hungry, footsore, ripped-trouser, camouflage-painted, lean, mean, son a b*itch who has kept the wolf away from the door for over two hundred years.

US Marines - (03--)
US Army - (11-)
Grunts do it better!

Those fuckin' grunts are cocky.
by Marine Infantry March 07, 2012
 
17.
A deep manly grunt performed by a lesbian. It is a signal to attract other lesbians to the area. Also used as a signal to alert the other lesbians that a new lesbian is in the perimeter.
A lesbian enters the room and alerts the other lesbians of her presents by excreting a very loud, manly grunt.
by DykeMomma1 April 09, 2009
 
18.
The little creatures in all of the Halo (X Box) games. They have what looks like cones on their heads and scream various sayings when dying
"Oh man, so many grunts everywhere, I had to use all my grenades and they STILL weren't all dead"

"Those damn grunts, so annoying"
by Bejungles.x October 27, 2009
 
19.
A front-line soldier.

A grunt is anyone, regardless of rank, who digs his or her own foxhole, performs front-line tasks, handles live weapons and ordnance and duties in combat zone and risks his or her life.

The opposite of grunt is REMF (Rear-Echelon Motherfucker), a desk job military person off the combat zone. If the definition of a grunt is one who digs his own foxhole, a REMF is anyone who sleeps between clean sheets.
To be a grunt in the Marines is the pinnacle of macho image
by Susanna Viljanen March 07, 2008
 
20.
a member of the marine corps whos MOS is infantry
right now it's all the grunts over in iraq on the front lines.
by SemperFi March 26, 2005
 
21.
The weakest of the Covenant, also the cutest ^-^
"Little people first!!!!" ~ random Grunt
by Dirge January 30, 2005