A totally undisguised fart, a proud display of arse trumpetting that causes whatever the giver is sitting on to reverberate like a car driving on the rumble strip of a motor-way. The best exponents can deliver a sound also similar to tyres on a rumble strip.
Brian was on the sofa the other night when he produced a grumble strip of such magnitude that his mrs shot her bolt in the excitement.
by TinoD August 19, 2009
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When a girl blows you and makes half Moan and half mumble something and you can't hear her. But continue spreading cum in her throat. Don't forget breath mints.
That whore totally grumble sucked me hard. Didn't hear what she said but I don't care. She only cost me $30
by boost the monster May 13, 2015
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When someone is hungry for a specific food item.
Brian had a case of the grumblies so he went to chick-fill-a.
by Raviolionmytoes November 3, 2019
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When describing a mouldy pussy that is crunchy like cornflakes and as dry as your mums shitty cooking as well as growing a crumbly greeen tinge
Person1: Oi anya lemme get some of that coochie
Anya: errrrrrr but...
Person1: oh ffs u got stinky grumble dont you
Anya: to tell you the truth yes... yes i do
Person1 @ the whole party: ANYAS GOT STINKY GRUMBLE
Whole party: everyone starts fucking her up all that survives is the already decomposing coochie grumble
Person1: *probably still fucks her*
by Shmuckboy12 April 8, 2020
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Internet commenter whose entire output consists of complaints. Grumble junkies are mostly conservative-leaning posters complaining about the President (and any one remotely associated with him in any way), though experts theorize that should a conservative get elected President, liberals will rapidly take to the fore of this peculiar subcuture.
Real Concerned Citizen: "Impeach Obummer, Biden, Holder, Reid, and Kerry NOW! The government is conspiring to take YOUR (insert amendment here) rights!"
(scramble names, repeat 10x daily)

Reply: "Man, you are such a grumble junkie."
by nycsongs November 27, 2013
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A gurgling fart bubble that pops with a low groan.
I popped a grumble-grape in my pants last night leaving a nasty stain.
by Drpig123 November 26, 2010
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a combination of the sickest, most disgusting porn

an example of grumble porn is:
a still born male siamese horse with it's head up with mother's arse being shat on, with a male old midget bum fucking it whilst spank the horse with a whip
"Haha, Jack's into Grumble Porn!"
by Dan July 13, 2003
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