1. looper - Noun
2. Looper - Proper noun
An instrument, as a bodkin, for forming a loop in yarn, a cord, etc.
The larva of any species of geometrid moths. See Geometrid.
Source: Webster's dictionaryBy using a looper pedal, a singer-guitarist in a one man band can play the backing chords to a song, loop them with the pedal, and then do a guitar solo over the chords. Source: Internet
The most expensive multi-effects units may also have looper functions. Source: Internet