Source : WordNet®

flump
     v 1: fall heavily [syn: {flump down}]
     2: set (something or oneself) down with or as if with a noise;
        "He planked the money on the table"; "He planked himself
        into the sofa" [syn: {plank}, {plonk}, {plop}, {plunk}, {plump
        down}, {plunk down}, {plump}]