Well, then, BUCKLE up.
You're in for a cranky night.
The Big Bang Theory Season 8, Episode 20
Ooh, look, a new Batman belt BUCKLE.
The Big Bang Theory Season 2, Episode 20
All right. Let's BUCKLE down and work.
The Big Bang Theory Season 3, Episode 4
It said right there on the invitation,
"Buckle up for fun!"
The Big Bang Theory Season 10, Episode 19
Well, then, BUCKLE up.
The Big Bang Theory Season 1, Episode 4