Also found in: Dictionary, Thesaurus, Medical, Encyclopedia.
hop something up
Sl. to make a machine, especially a car, run extra fast or give it extra power. He will take that junk heap home and hop it up. He spent nearly every evening hopping up his old car.
hop up (to someone or something)
[for an animal] to come close to someone or something by hopping. The bunny hopped up to me and just sat there. It hopped up and stared.
To stimulate someone with or as if with a drug. Used chiefly in the passive: The drug addicts were hopped up on cocaine.