Primer for the hard of thinking:
Chav = Horrible youth who drinks alcohol & takes drugs (after robbing old ladies for their money), steals cars & generally screws Chavettes (sluts).
Tracky Bottoms = Tracksuit pants
Carlsberg Extra Strength lager = Standard type of alcohol consumed by Chavs (that, or Stella Artois)
'Twocking'. TWOC = Taking Without Consent. Stealing a car & driving such at high speed