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3.
n. A light bulb, although usually used for lamps and such, can be used to smoke meth.
"Hey are you passin' that bulb around? Can I get a hit?"
by Holly-Day February 02, 2004
 
1.
a good idea.

derived from classic cartoons when the characters have a lightbulb appear above their head when they have an idea.
Guy #1: "I'm bored"
Guy #2: "Let's go paintballing!"
Guy #1: "Good bulbs man!"
by lettuce guy December 22, 2009
 
2.
Is a person who is an absolute dimwit.Used in Liverpool,UK.Can be used when they are also useless in most every day scenarios.
I told you before that he is an absolute bulb, so stay away from him.
by MichaelK June 24, 2006
 
4.
General term for well meaning but unreliable person, often intelligent but prone to lapses in concentration and brain function.
I see Andy is late getting to the pub again?
I doubt he'll show up, you know what a bulb he is.
by Dr Boswell November 08, 2004
 
5.
A small, 1 serve cannister of Nitrous Oxide used for getting a kinda fun, but quite pathetic 5 minute high.
Possibly puts bubbles in your brain.
"Keen for a bulb?"
"Let's go do some bulbs."
by Diego August 14, 2003
 
6.
The head of a circumsized erect penis if of greater girth than the shaft.
Look at the bulb on that dude! It twice the circumference of his cock!
by dicklicker May 23, 2003
 
7.
A bulb is somebody who has difficulty forming thoughts and sentences on his own, yet insists on doing so on a public forum.

(by @cgawker on Twitter)
A: "Haaaaaiiiiiii sweettttttyyyyyyyyyy!"
B: "Dude, that A is a total bulb."
by i-r-squared August 12, 2010