ton-up

adjective (prenominal)

(esp of a motorcycle) capable of speeds of a hundred miles per hour or more
liking to travel at such speedsa ton-up boy

noun

a person who habitually rides at such speeds

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012