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countable and uncountable, plural BMXs or BMXes
(uncountable, cycling) Bicycle motocross, a form of cycling on BMX bikes, originating in California in the 1970s. examples
(countable, cycling) A BMX bike. examples
third-person singular simple present BMXs or BMXes, present participle BMXing, simple past and past participle BMXed
(intransitive, cycling) To ride a BMX bike. quotations examples
I BMXed from 1978 (my first race) till not too long ago. Although I don't see too many freestylers in the net, I get in touch with quite a few ex-BMXers like myself on rec.bicycles.off-road (I'm cross-posting to it).
1995 February 21, Joao de Souza, “Re: B.M.X... Flatlanders and Freestylers”, in rec.bicycles.misc (Usenet)
Yeah, flippity trick things are fun. I've got a friend who has BMXed for 15-16 years! He rules, and he used to be sponsored.
1997 June 17, KrUtCh [username], “Re: Skate-boarders...losers?”, in alt.skate-board (Usenet)