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1.
The snail that comes out of the Holo-Recorder in the TV show Futurama. When the Holo-Recorder is played badly, the grumpy snail often becomes "too grumpy". Can also describe someone who is grumpy.
Fry played his song so badly, the Grumpy Snail mutated into a horrifying image.
by Zide July 06, 2009
 
2.
When one partner lays reluctantly on his/her stomach and is then penetrated in the anus by their partner. Said partner has their back haunched for maximum insertion-giving the appearance of the shell.
"Tina owed me a favor so she let me give her a grumpy snail before we left for the party."
by fireman623 October 17, 2013