greasy side

trucker cb slang for the undercarriage of a motorized vehicle

there is a four wheeler in the ditch with the greasy side up

by a truck driver January 31, 2009

keep the greasy side down

An action; as in travel safe or keep your vehicle on its tires. Keep the underside of your vehicle to the ground...keep the greasy side down! The undercarriage of older vehicles especially, could be found unusually greasy and full of oil. In instances where there may be an oil leak on your vehicle or the exhaust was excreting oil.

You're heading out on your road trip to Yellowstone Park? Well then, keep the greasy side down!

by AB in MT February 18, 2010