A north west England name for someone who is flashy and female,flaunting sexually. The term comes from the way someone "dances" about when being hung... hence the reference to "jibbet", or gallows
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.