zonkinghttp://www.oed.com/dictionary/zonking_adj%3Ftab%3Dmeaning_and_usezonking, adj.
First published 1986; not fully revised

zonkingadjective

slang.
  1. 1958–
    Frequently as quasi-adv. in zonking great.
    Stressed as ˈzonking.
    1. 1958
      He would give one a zonking great clip on the ear.
      Spectator 25 July 130/2
    2. 1959
      She was now technically a ‘star’ owing to her zonking success as Claudia.
      P. Bull, I know Face vi. 100
    3. 1959
      She..is a zonking great film star.
      P. Bull, I know Face vii. 126
    4. 1973
      Long Day's Journey..was the first big, zonking part he played after his cancer.
      Daily Telegraph 9 February (Colour Supplement) 36/4
    5. 1976
      Rather than play these zonking great parts..I will try to find some dazzling little cameo roles.
      Times 21 May 4/7

Originally published as part of the entry for zonk, v.

zonk, v. was first published in 1986; not fully revised.