When you shove your tongue up someones nose.
He moved his face closer to hers.... Then shoved his tongue up her nose and yelled "I'm a Puffskein!". This is puffskeining.
Surprising someone with the insertion of your tongue up their arsehole.
He removed his tongue from her underlips... Then suddenly darted it into her asshole! He screamed: "I'm a Dirty Puffskein!"