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"to prance about in a self-satisfied manner," 1872, coined by Lewis Carroll in "Jabberwocky," apparently by blending gallop and triumph. Related: Galumphing.
To move or cavort ungracefully; crash heavily about: Linda Evans galumphing around the edges like a wounded rhino/ who had seen him practically every day of his life galumphing around the house naked
[1872+; coined by Lewis Carroll in Through the Looking Glass]