The cousin of the heffalump (a fictional creature from Winnie the Pooh). They are closely related, however they differ in that the humpalump prefers close contact with other humpalumps at all times, where as the heffalump is rather shy and keeps to himself.
Bobby: Mommy, why won't that humpalump get off the other one? What are they doing?
Mom: Oh Bobby, I'd rather you didn't watch that. Go look at the heffalumps. They're much more kid friendly.
to fuck a fat person in a time of desperation...
Felicia humpalumped Ross in the shed.