What does pending mean in Snapchat?
Pending may refer to the fact that the person has not added you yet or the message/photo/sound didn't arrive to its destination. In this case, you can just wait because there is nothing else you can do.
Pending as in OUR snap hasn't sent or theirs is trying to reach my snap? Because I Unfriended someone and it says "pending snap" underneath
I just did this- it means they have have sent you!
I know this as I had the same message - a deleted friend with "5 pending"
I added them back & the 5 messages (from them) came through.