cockers-p, n. — Green’s Dictionary of Slang

cockers-p n.

[elision of SE and + -er sfx²]

(UK society) a cocktail party.

1983		New Society 10 Mar. 384/3: A drinks party might be a ‘do’ or ‘drinkies’; a cocktail party could be described as a ‘cockers-p’.
2003		A. Kimbell Unbridgeable 171: Trust Angela to still call it a cockers-p; surely, these days people just came to drinks?