When a chick is out in the bush (biking or hiking etc) and needs to pee, then she 'shakes the beaver' to encourage the drip dry process because there's nothing to wipe with
Sorry I took so long, I needed to pee and I had to shake the beaver for a bit because I haven't shaved for a while.
An awkward physical greeting where one party comes in for the high five, but attempts to retreat to a handshake resulting in the embarrassing vertical hand shake otherwise known as a five-shake.