Slang; when you meet someone new and aren't convinced by the front they're putting on, so you do some digging into their background to try and find dirt on them.
Alice: Hey Bob, what did you think of our date yesterday?
Bob: It was fine. But I Googled your name when I got home and found a mugshot of you. Why did you rob a bank?
Alice: Wtf, quit butt sniffing!
Bob: It was fine. But I Googled your name when I got home and found a mugshot of you. Why did you rob a bank?
Alice: Wtf, quit butt sniffing!
by UTMcGee February 27, 2020
When you meet someone of a similar caliber and neither of you knows who's who...excatly. You have to ask loaded questions and wait for responses.
I know you're new here, but everyone else knows each other very well. There's going to be some butt sniffing until people get to know you.
by joshsmith01 July 11, 2017