What is "hopped-up"

Usage examples of "hopped-up".

Colonel Cathcart, who came blasting into the squadron in his hopped-up jeep the day after Major Duluth was killed over Perugia.

We rode out to it in the Bomber, dressed out in our flannels, more anxious than we’d admit about taking on these Negro barnstormers in front of a hopped-up crowd of colored GIs.

Also outside the pale was Major Major, the squadron commander, who had found that out the same time he found out that he was squadron commander from Colonel Cathcart, who came blasting into the squadron in his hopped-up jeep the day after Major Duluth was killed over Perugia.

The truckers were regulars at the Nest, but the rednecks were from out of town, as were a hopped-up bunch of swordfishermen who were talking loudly around the pool table.

It, strictly speaking, was not a bomber but a hopped-up stock car.