Kaplok

Kaplok is an unidentified Klingon act or custom, possibly sexually related.

During a visit to Deep Space 9 by the IKS K'Tang in 2370, one of the Klingon officers learned that Major Kira Nerys was once a part of the Bajoran Resistance and offered her kaplok in a holosuite. While Kira was able to decline the offer, Jadzia Dax commented that she would enjoy it as Curzon Dax was known to once and a while. (DS9 comic: Hearts and Minds - Prelude).