Negation of a barf and a laugh, like when you are laughing so hard you spewfood, and suppress the spew with a napkin or your little sister's sweatshirt.
OMG your cousin was so funny at the wedding reception, I had to blafnar.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.