look up any word, like blumpkin:
 
1.
1. so-so, kind of, a little bit.
2. one who can't handle their alcohol/weed
1. That party was lightweight tight
2. Look at that lightweight, puking after two cups!
by BigBossMike December 04, 2004
 
2.
Light weight is getting drunk really fast
"Are you a light weight?"
-No, it takes me 5 or more shots to get drunk!-
"Oh, I am because I get drunk really fast off 2 shots."
by blue_eyes July 12, 2004
 
3.
1 A small amount or a little bit
2 Someone who cannot handle consuming large amounts of drugs or alchohol
1 "That movie was lightweight stupid"
2 "He's so lightweight he's high after one hit"
by xLUISAx September 03, 2005
 
4.
Someone who has a low tolerance or stamina in a certain situation.
P1: Dude, I'm going home.
P2: Dude, the library doesn't close for another 2.33333 hours.
P1: I'm tired.
P2: Dude, you're such a lightweight.
by R Squared February 07, 2006
 
5.
one who can only handle small amounts of various drugs
1 hit and I'm gone. I'm such a lightweight.
by Bungalow Bill November 26, 2001
 
6.
a little, a small amount

originated in the San Francisco Bay Area
Homie #1: You wanna get your perk on tonight?

Homie #2: Lightweight
by dazvoltron May 24, 2004
 
7.
One who fails at drinking.
- Yo, did you see Kenneth last night?

- Yeah! He got wasted off beer mixed with sprite!

- Oh man, what a light weight.
by Kenneth Lipa June 30, 2009