The awkward fumbling after greeting who is usually a distant relative. Neither party is sure whether to hug or shake hands, and so the dance begins, wherein both parties seem to do a sped-up version of the robot, first extending an open hand, then switching to open arms, with the other party doing the opposite.
Usually, this occurs with an in-law, but in some cases a drunkle is involved.
This always results in awkwardness, embarrassment, and comedy.
Mack: Did you see my hugshake with Mel?
Jake: Oh fuck, that was more awkward than Sarah Palin trying to answer a question about foreign policy.
Mack: ...so you're trying topical humour, eh? Palin, really?
Jake: Piss off, Mack.