look up any word, like dirty sanchez:
 
1.
An electronic device designed to sequence sounds (kick drum, snare, etc.) to a pattern. Drum machines commonly have only 4 measures (with 4 beats). Drum machines are most commonly used by hip-hop and techno producers.
I just sequenced a kick drum on the first beat of each measure and a snare drum to the last two beats of the measure on my drum machine.
by Sanyote April 25, 2006
 
2.
An electronic musical instrument designed with the explicit purpose of putting the likes of Ringo Starr and Phil Collins out of work.
How many drummers does it take to change a lightbulb?

None, they have a drum machine for that now.
by Future Drum Major September 02, 2011