When you send something on Snapchat and someone just views it. No big deal if the conversation is nothing trivial, but could get annoying if you asked a important question that you need to know about now.
Left on open
Person 1 (opens message but doesn't reply)
Person 2- Lol fuck you, (blocks person 1)... Get blocked bitch!
On Snapchat, when someone you've been snapping views one of your messages but hasn't yet responded. Stop whining, it's not that big of a deal and it doesn't mean they hate you, it just means they're busy or they thought the conversation had ended.
Liza: Oh God! Paulie left me on open! That bastard! We're over now! I want to die!
Winnie: Stop your cryin. He's at work and he's not supposed to be Snappin you in the first place. Just cause he's busy and you're left on open for the moment don't mean he hates you.