flump /flʌmp/noun 3verb 2exclamation 1forms 3phrases 1 noun3 •An instance of the dull sound so produced. •A type of large marshmallow.So it means you'll always have room for ice cream, flumps, strawberry sauce and a chocolate flake. — 2016 •A fat out-of-shape person.Ruth said: 'I recently treated myself to a fitted, hot pink dress for a night out and banished that image of being a fat, pink flump for good.' — 2015 verb2 •To move or fall heavily, or with a dull sound. •To drop something heavily or with a dull sound. exclamation1 •A sound of something moving or falling heavily, or with a dull sound."Now again." The boy readies himself. The other children stand and stare. Parents look on expectantly. Flump . . . he lands on his back. — 1986 formsflumped · flumping · flumps Phrases with flump flump downTo lie or fall down in a tired manner