Also found in: Acronyms.
A contraction of "shoot 'em up," a video game genre in which the objective is to shoot a large number of enemies while maneuvering to avoid their attacks, especially by controlling a single spacecraft or aircraft. I used to love playing shmups at our local arcade growing up. It required such quick reactions and skill that you really felt like you had accomplished something when you finally made it all the way through!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.