A gender-neutral euphemism for masturbating. Generally done in between the periods of saying goodnight to someone and actually going to sleep.
by HeatseekingHobo August 3, 2015
1. Making love to a fat chick. The stench in the sheets after she leaves is similar to that of a grilled cheese sandwich. 2. Code word for banging a fat chick.
Friend: I made a grilled cheese last night.
You: You really got to lay off the fat chicks.

Friend: Where is Tim?
You: Making a grilled cheese :wink wink:
by Fatty Slayer October 12, 2011