Used to describe an undesirable outcome. Also appropriate to describe the act of being struck in the testicles. Analogous with a "kick in the nuts".
Pat: Did you hear about Marc catching the HIV?
Derric: Yea, what a slug in the groceries.
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