Akademik

v.

To ride along, usually while on a skateboard or while wearing roller skates or inline skates, with a moving vehicle by holding on to the bumper or other handhold. (A blend of "skate" and "hitch".)

"Other drivers, however, allowed the skaters to 'skitch' up the most brutal of hills holding on to their bumpers."

— Carey Goldberg, "San Francisco Journal: Night Skaters Claim Streets as Their Own," The New York Times (quoted in the Barnhart Dictionary Companion)