Top Definition
A promiscuous individual who, upon the look out for dirt cheap sex, takes his date home on the bus: a defining term for the sleaziest, most common and thrifty avenues for obtaining sex.
"Harry is such a Bus Slag, I saw him taking a brassy blonde home via the 505 to South Oxhey in the early hours."
by Brashy407 February 28, 2010

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