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A gromper is a unseen creature that lives in holes or caves known as "gromper holes." They are typically active at night and low light hours especially in sparcley populated areas. Their activities range from mischievous trickery to the occasional kidnaping and eating of lost travelers.
"Stay away from there, that's a gromper hole if I've ever seen one."

"Don't go outside or a gromper might get you"
gromper by My'vatn May 14, 2017
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To engage in sexual activity after a period of hygienic neglect, frequently signified by the development of a urinary tract infection in a female partner.
"I worked all day and didn't have time to shower, so I had to give Susie the ol' gromper."
gromper by Hajah Hakaha December 3, 2013
Related Words

Monster Gromper 

An absolute monster of a vibrator, I'm talking fist sized, pump-action pussy pounding destroyer.
I just found this old ladies monster gromper.
Monster Gromper by -Sheldonsleftleg September 25, 2025

gropper-time 

(slang) Voluntary intervals of time within the workplace used to measure non-performance of job functions whilst still receiving houry stipends for said functions. Gropper-time may be practiced in groups or independently.
"Fuck, look at my shitty paycheck...let's get some Gropper-time tonight, yo."
gropper-time by MRDURDEN January 9, 2009
An especially hot and steamy shit. Grumpers often leave you very sweaty and exhausted. They're mostly taken under less than ideal situations like port-o-johns and bar bathrooms.
Man I was tailgating on Saturday and I had to shit some fierce. I went to the port-o-John and dropped a fiery grumper. My asshole was never the same.
Grumper by Alexdlegit March 25, 2017

Groupert 

You've heard of a flock of sheep and a herd of cows, but have you heard of a groupert of Ruperts?
Groupert by alex_s_28 May 25, 2019
1. someone who tries to sneak sexual touching while the other person is unaware.
2. takes advantage of people who are passed out
3. a pervert
4. a man who gets tossed out of a strip club for unauthorized touching of a stripper.
Rich is such a groper, he got shit canned out of Cheetas when he grabbed Candy's teats.
groper by Bud E Love May 6, 2003