look up any word, like cunt:
a floor cleaning machine used my janitors commonly found in big public buildings. may be a rider or push. can be used for many purposed other than cleaning, such as joyriding, transporting goods, racing, stunts, etc.
Dirt: dude the other day at our basketball game we found a siweet janny mobile. greenie got it running and everything!

Bass: That is sick dude. Janny Mobiles are the greatest thing known to man.
by BASS3031 February 04, 2010