I should add on to that last post (below) that Vee has been saying similar phrases for years. For example:
Me: I made an apple pie (one of his favorites).
Vee: Slash, cheer, enter!
It's just the way he talks.
And before I complain that, "it's not normal", I'll instead take a wee bit of a reality check. He doesn't swear. He's polite. He has always treated me and other family members with respect.
Slash, cheer, enter!