fist bump

when 2 or more people, friends, make a fist and bump each other
with their knuckles as a way of saying hello, what's up,
keep up the good work,

see bump me

An alternative to a high five or handshake, often seen in sports. The white person's term for dap. Preferred by germophobiacs such as Howie Mandel. According to Fox News, a terrorist action.

When two people are both fisting a girl at the same time. One fisting the vagina and the other fisting the arsehole. While both are fisting the fists hit each other as a form of a bump. 'Fist Bump'