A musical genre refering to many newer "indie" bands who play catchy, danceable songs. The tunes usually have a very basic "disco" beat consisting mostly of snare and hi-hat patterns. The guitar is usually very brisk sounding and slightly overdriven, consisting primarily of barre chords. The basslines are typical disco-esque and driving. What makes these bands psuedo disco is that they're several decades late and claim to be "rock" or "indie".
A primary example of a pseudo disco band is Franz Ferdinand and they are awesome.