When people that are your friends (or are supposed to be) tell you fucked up jokes right to your face, insulting fucking jokes followed by a "nah nah nah". Those people are sneak haters. NOTE: There's a thin line between fucking around with your friends which is a normal thing to do, and sneak hating. If your friends are doing this to you, they're probably also talking shit behind your back.
Man, last time I saw Joe at that party he kept making fun of my Shoes, but when I raised an issue he'd just say "I'm just kidding bro, take it easy". That fucker was sneak hating on me so hard! I'm sure he was making fun of me later at the party after I left! Can't trust those sneak haters.
A description that applies to the best type of person: someone who embodies cheekiness and slyness in a highly positive sense of the concept.
Confusingly, most people described as sneakchildren are likely to be adolescents or young adults.
He is such a sneakchild. Just look at that expression. I don't know if I just want to pat him on the head, hug him, jump up and down in excitement or rofl. His sneaky cheekiness makes me happy.