To lie on/under/entangled with your other half, usu.in bed, in a non sexual and entirely lazy way (although lumping can of course lead to sexual activity; however, it is usually engaged in after sex or when the couple are extremely tired/hungover/on a comedown.)
Lumping can be done by oneself on objects other than a person for example cushions/floor, but research has shown it is most comfortable when done on another person.
I'd rather be at home lumping on you.
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