1 definition by Budgie Ramone

A head butt, ramming someone with your bare head. Derived from the idea that a toothless individual has to gum their food, therefore a hornless individual would have to "gum" someone when head butting them.
Don went charging through the mall like a bull horngumming people at random until security came and removed him.
by Budgie Ramone December 18, 2011

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