Top Definition
The Foghorn on the city-side of the Golden Gate Bridge in San Francisco.

Whoa, it is foggy this morning. I can hear the Foghorn by the Golden Gate blowing.

You mean Umbo?

Yeah, perfect name for the Foghorn
Whoa, it is foggy this morning. I can hear the Foghorn by the Golden Gate blowing.

You mean Umbo?

Yeah, perfect name for the Foghorn
by jay duret March 06, 2015

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In San Francisco, a boner triggered by the sound of a foghorn blowing.
Did you hear the foghorn on the Golden Gate Bridge blowing last night?

Yeah, gave me a wicked umbo.
by Jay Xuret February 02, 2014

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Umbo

A raging boner.
Whoa, I have got a real woodie this morning.

You mean an umbo?

Yeah, its so hard I could use it to drill for water.
by jay xuret December 10, 2013

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Urinating my bowels out
watching orpahns being cooked in a boiling kettle makes me umbo
by gumless but with brushed teeth January 01, 2011

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