give it/her the gun
To accelerate or rev an engine. The burglar leapt into the getaway car and yelled, "Give it the gun, the cops are coming!"
Give it the gun.
and Give her the gun.Fig. to make a motor or engine run faster; to rev up an engine. (The her is often pronounced "er.") Bill: How fast will this thing go? Bob: I'll give it the gun and see. Hurry up, driver. Give 'er the gun. I've got to get there immediately.
give it the gun
accelerate powerfully in a car. informalgive it the gun
tv. to gun an engine; to rev an engine up. I gave it the gun, and it backfired.