Definition of top or full whack in English:

top (or full) whack

chiefly British The maximum price or rate: the car has a top whack of 107 mph
More example sentences
  • They do this by passing on the full whack to borrowers, but only slightly increasing their savings rates.
  • Why should people who drive cars over 2.7 metres in length have to pay the full whack?
  • Although this remains the case in Scotland, councils in England can now charge up to 90% of the full rate, while councils in Wales can levy the full whack.
See parent entry: whack

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Pronunciation: ˈgʌz(ə)l
verb
eat or drink (something) greedily