An elegant way of expressing you're disbelief.

its a more casual version of what the fuck

Shrek is the best animated character from Disney, and now a parcialy dead meme. Little do the public know that it can be used as an alternative to swearing!

another way of saying what the heck

The most incredulous of the wtf's, what the sincere fuck is used asking for clearification of something so fucking terrible it is hard to believe and one using wtsf is often looking to deny its happening or existence in the first place.

Another way of saying "huh?". The word smurf replaces different cuss words, keeping the speaker out of trouble.

Something teen boys say to eachother when they're too nerdy to curse. Usually social outcasts