Top definition
Whilst travelling by motorised transport, vibrations felt may cause male passengers to develop an erection.
"....The car journey was taking forever but luckily Alex had developed somewhat of a Travellers Marrow to entertain him ...."

"....The rest of the coach passengers gasped in awe at the Travellers Marrow, the sleeping Alex was sporting...."
by KingKempo February 10, 2010
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