John: Did you hear what Monica and Scott did on their bike trip?
Tim: They biked-out.
Mike: Mary, wana bike out?
Tim: They biked-out.
Mike: Mary, wana bike out?
by Mychal Kyle October 22, 2010
The term used to describe 'making-out' while riding parallel with another biker. With reference to 'The Simpsons EP2005'.
"Hey Marge, i've thought of a new thing. It's called 'Biking Out', its a combination of Making out and Riding a bike"
by theguybrian April 6, 2009