Top Definition
When the vibration of a bus you're riding gives you a boner.
I was afraid to get off the bus at my stop because the ride gave me a bus-on.
by rueluv February 19, 2007
5 Words related to bus-on
an erection/hard on caused by the vibrations of bus travel
'i've got a bus on'
by douglas1 October 29, 2009

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