Headbutt

From SmashWiki, the Super Smash Bros. wiki

Headbutt is Donkey Kong's Smash B move. As its name suggests, Donkey Kong performs a headbutt. This attack can meteor smash an opponent if used in mid-air, or plow them into the ground, rendering them temporarily immobile, if used against opponents on the ground. Headbutt comes out faster in Brawl than in Melee. It can be utilized to break shields.

Headbutt is useful for performing a KO combo. Trapping your opponent then using a fully charged Giant Punch or side smash can result in a KO. This combo has a higher chance of working if the opponent has a medium to high damage percentage. The higher their damage is, the longer the opponent will stay stuck. Also this can only work in Brawl,as in Melee nothing can dig out the trapped victim.

Donkey Kong's Special Moves
Standard Special Move:	Giant Punch
Side Special Move1:	Headbutt
Up Special Move:	Spinning Kong
Down Special Move:	Hand Slap
Final Smash2:	Konga Beat
1: In Super Smash Bros. Melee and Super Smash Bros. Brawl only. 2: In Super Smash Bros. Brawl only.