pop off

I'm just popping off to the shops to pick up some bread.

When Captain Sleet in person stood his mast-head in this crow’s-nest of his, he tells us that he always had a rifle with him (also fixed in the rack), together with a powder flask and shot, for the purpose of popping off the stray narwhales, or vagrant sea unicorns infesting those waters; […]

The Long Lances, however, were thick in the water, and soon Portland was hit in the stern, sending her turning donuts across the ocean trying to work out which way to point her guns, popping off occasional shots at Hiei, which, by now, was heavily ablaze and a very obvious target in the night.

popping off at the mouth

to pop one off with a denial

Pop that light off, will you?

After changing my mouse sensitivity, I immediately started popping off.