It's a light saber
belt BUCKLE.
The Big Bang Theory Season 12, Episode 24
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
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