Made familiar by several World of Warcraft (computer game) machinima videos. Originally meant the fastest rideable creatures in the game, later on became a synonime for hot & easy chicks. See mount.
I don't buy the schmegegge about Morty sleeping with Moira.
His version of the story was pure schmegegge.
The whole schmegegge was made up to get Liz a little bit of attention.
Looking or experiencing something nice after witnessing something horrid like a disgusting gif or a disturbing video. Typically used as eye bleach are nice images of whatever makes the disturbed person happy.