1. "He went galumphing back." (Lewis Carroll, "Through the Looking-glass and What Alice Found There")
2. The little kid went galumphing to his mother to show her something.
The act of going for a toss in the hay; passing the graving; churning the butter; feeding the pigs; passing the mustard; buttering the biscuit; unsheathing your weapon; doing the dirty; snarking the snake; having sexual relations with another person.
"Yeah, man, me and that chick were galumphin' all nightlong.