When you masturbate and, upon ejaculation, lose track of some of the fluid so that you either can't find it and give up, or it appears later in a completely surprising location.
Me: So I was jacking off last night, but I had an MH370 and I'm not sure where some of the jizz went...
Them: Did you give up looking for it?
Me: No, I found it a few hours later on the other side of my room...
Short for Malaysia Airlines flight 370, a missing Boeing 777 aircraft, which vanished after deviating off course and flying to a spot in the ocean between Perth, Australia, and Madagascar.
(Mh370 because MH is Malaysia Airlines 2-letter IATA identifier code)
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"