Ringos

When it's boiling hot or you've just completed a workout and you're sweaty, but you've worn a top and the sweat has clearly seeped through the armpits creating a ring in the shape of an 'O'

"Ah man i've just jogged to work and now i've got huge ringos under my arms!"

"I've got a hot date tonight and I can't stop sweating... I'm gona have huge ringos by the time we meet"