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

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Top Definition
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

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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

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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

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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

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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

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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

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