1: A style of music emerging in the 70es with nice simple drum lines. Normally
  1. Basedrum
  2. Hihat
  3. Snaredrum
  4. Hihat
ad libitum (in half tempo - but there's no node/score editing funcs in html - this'll've to do) Style is also often featuring nice lead vocal by singers who actually know how to sing and some octavish baselines combined with some string sounds from some sh*tty synthesizers.
The style was/is so popular that a lot of bands today exist only to either perform disco tracks and others just try to make cover versions that are better than the original ones (hardly ever happens).

2: The short and common way of saying discotheque

3: One of Uma Thurman's shorter lines in Pulp Fiction