Hand Slap (ハンドスラップ) is Donkey Kong's down special move. When performing it, Donkey Kong delivers an earth-shaking blow to the ground, sending nearby enemies skyward. It has considerable power, consistent and repetitive damage, and a large quake hitbox. Overall, it does 10% damage with each slap (14% in Brawl), but has high base knockback with low knockback scaling, meaning that it can't KO properly, and it's difficult to hit consecutively with it outside Team Battles.
This move is good against bosses, but only works on certain ground bosses. It is one of the few down special attacks in the Super Smash Bros. series that can't be used in the air, and in the original game, it was the only special move to do so. When used on a platform, enemies can also pass through the attack unharmed it they don't land on it, due to it being a quake attack.
In the co-op mode of Home Run Contest, when used along a character performing a fast rapid attack, such as Ness with his down tilt, it can quickly rack up tons of damage (potentially over 300%). It is also used often by casual players to complete Multi-Man battles.
It has been confirmed that Hand Slap would be Donkey Kong's down special move in the upcoming Super Smash Bros. 4
In Donkey Kong Country, Donkey Kong was able to do this move to get hidden items in the ground, though there weren't many places to do so. It also served as a second way to deal with enemies. In the game, however, DK would hit on the ground once with each hand each time, but was done the same way, by holding down and pressing attack. The move later appears in the Wii version of Donkey Kong Jungle Beat, as well as Donkey Kong Country Returns, also on Wii.
 Manual Descriptions
 Super Smash Bros. Melee manual description
 Brawl Manual description
"Slap the ground and send nearby foes into the air. Can be performed multiple times in a row."