Someone who is grumpy and collects a lot of grump to dump on you. Has the negative connotations of the similarly pronounced "cum dumpster". They have grump all over their faces.
by daydemon March 5, 2013
by Nick Wolff June 8, 2006
Usually not a morning person. A grump fuck will wake up and walk straight to the coffee pot with a pinched face of discomfort due to the fact that a grump fuck is very unhappy to be out of bed. Grump fucks are not restricted to morning hours only, grump fuckieness can happen at all hours of the day. See also bitchead.
Sometimes when I wake up in the morning I look in the mirror and realize I look like a real grump fuck.
by charlygordon123456 July 25, 2006
by Princess Sonic January 26, 2018
When a male has a very big erection in a public place that won't go away and creates a lot of frustration, in turn it causes him to hit someone or something out of sheer anger.
"In 1st period today I had the biggest stiff grump that I hit michelle Because she was the closest thing to hit."
by cuddycowboy36 April 12, 2010
Holy shit big Michael is such an Aussie grump.
by Jake👍🏼 December 5, 2016