look up any word, like b4nny:
 
1.
someone who is grumpy.
when you are upset and dont want to talk to anyone, you are being a grumpy gills

tom: how was your day? bob: leave me alone. tom: okay "grumpy gills"
by samuel.L.C January 01, 2010
 
2.
Someone being grumpy for no reason.
Joel, you're such a grumpy gills.
by Mdcf January 11, 2010
 
3.
cat-butt
stop being a grumpy gills
by joemauer October 19, 2010