Impersonation of Stalin
To perform oral sex on a woman. So called because from a womans perspective whilst having oral sex performed on her the other player would resemble Stalin, WW2 Russian dictator renowned for his bushy moustache.
Okay love, before we get down to a bit of the old heave-ho i though i'd just nip downstairs and do a quick impersonation of stalin, just to say i love you.