Small chug

A small chug, which is intended to be a small chug of small amounts of any fluid. It sounds like as if it would be a big chug, in terms of, chugging a whole, full glass of cold beer, but as said this is defined as chugging a small amount of fluids of any kind, in a rapid way.

There was so little left in the box of milk, he performed a small chug, drinking what's little left in the box.

That's a small chug. It's like a chug, where you drink a whole glass of something in a competition, but only what's left in a glass.