Top definition
This is a nickname given to someone who is cynical, hates fun, and hates it when other people have fun. Originally derived from the stereotypical view of an angry grandmother who thinks her grandkids shouldn't be allowed to play and have fun.
Don't be such a Grandma Kill Joy, come to the party! It will be fun!
by Jackie | Treehorn December 15, 2010
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug