Top definition
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."
by Hajah Hakaha December 03, 2013
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2
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"
by My'vatn May 14, 2017
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