"Button combos" refers to a series of specific button presses performed in a video game to achieve a particular move, action, or combination of moves. Full definition
The implementation of button combos for different attacks feels very reminiscent of a fighting game, albeit not quite so complex. (stevivor.com)
This leads to the characters having 1 of 3 different button combos. (allpcgame.net)
While this interface isn't immediately intuitive, it seems to make the analog stick + buttons combo more forgiving, allowing one extra movement in any direction as a margin of error. (xblafans.com)