The act of having sex with fruit, and/or cumming into them by drilling or cutting holes into the side of a fruit and inserting your penis into the hole.
"Did you hear what Jacob did?"
"He fucked a watermelon"
"Oh that's nothing, Derek made love to cantaloupe then a grapefruit just last week!"
"Jacob's mom thought the fruit was spoiled because it had runny white liquid in it."
"She's probably never heard of Cumquating before."