When a guy gets hurt in a relationship and he aggressively tries to bang as many girls (typically bar skanks) as he can in an attempt to move on and hide from the pain/humiliation of the breakup. It is often paired with excessive alcohol/drug abuse in a dangerous combination of self-destructive behaviour. The term comes from various shooter games where a player comes out much more reckless than usual after being killed in embarrassing fashion.

A cryptocurrency of little to no value, usually a late-comer to the Bitcoin craze, a copycat cryptocurrency.

1)In frag based combat, a 'Killing Spree' consists of 5 frags without respawning. Similar to RunningRiot

A spree in which people are killed. See massacre.

In Unreal Tournament, getting 5 frags in a row without dying.

a five kill streak in halo w/out dying once.
after killing spree comes running riot, rampage, berserker, and finally over kill

In Online FPS games (Halo, CS) a killing spree is to kill a number of other players, without dying yourself.