Top definition
Lose your marbles = lose one's mind, insanity, person who does not have common sense/wits.
"Lose your marbles"
I knew she'd eventually lose her marbles = I knew she'd eventually lose her common sense/rational mind

Have you lost your marbles?. Means the same as "Have you lost your mind"?
by DAlmighty May 12, 2009
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