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.
by Alexdlegit March 25, 2017

by benwad934 March 30, 2004

A new social networking site that is growing in popularity. Where the Internet goes to complain. www.grumper.org
by Asyra June 10, 2009

by SexualVegan6Love9 June 28, 2009

by Phartman February 28, 2013

A decorative bumper commonly found on Jeep Wranglers that combines a bumper and grill. A must have bolt on part for any JK mallcrawler with 20"+ wheels that wants to distinguish themselves from the standard "Angry Eye" jeep.
"Kyle just dropped $1500 on that new Fabfours Grumper, friggen shame he he didn't spend it on lockers, eh? "
by Hokenstad July 30, 2019

by John Clever November 27, 2002
