Someone who doesn't wash their hands after taking a shit thus making them really smelly. They may also have traits such as choosing the worst people to be their partner.
I heard that toilet flush but not the sink run, don't tell me you're Kleg.
Think of Klingons on the starboard bow. Whenever one takes a shower, there will also be arse Kleggs to deklegg.
My girly housemate who was fresh from the shower, bent over, and I felt like I was having a fight to the death with Worf from Star Trek, as a result of her arse kleggs.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.