The undesirable effect achieved when one tans their front and back forgetting the all important side area. Most common in larger sunbathers due to the increased surface area and best effect achieved by topless flat chested people predominantly males. Red tannards are particularly sore.
Wow mate, you've got a real tannard going on there, roll on your side!
Mostly, clankin' tankards just means getting sloshed - most likely in a medieval setting. However, the phrase could absolutely be a euphemism for something (like getting railed in a sundress by an Hobgoblin, or getting boofed by a Bugbear).
"Avast ye! Hast thou been Clankin' Tankards at the Gasping Gander?? I can see the juices all over yer face!"
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.