Top Definition
An idiot, a numbskull.
Tim: Look at that person stealing that bag.
Mr M: What a mental lightweight.
Tim: Hey that's my bag.
Mr M: Sucks to be you.
by Eric3831 February 09, 2008
5 Words related to mental lightweight

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×