A term used to describe a very specific form of copulation:
During sex, the male penetrates the female, but shifts his body opposite to hers and, while on all fours with his legs spread in a fashion analogous to a frog, proceeds to bare butt fart directly in her face, thusly mimicking the deep and guttural "ribbit" of a bullfrog. Note that bare butt farting has been referred to as "the future of sex" in some forward thinking academic circles.
"I was bull frogging some hoe so hard last night she threw up twice!"
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