
...but I'd rather swim BUCK naked
across the Ganges...
The Big Bang Theory Season 3, Episode 4

Yes. Buck up.
The Big Bang Theory Season 5, Episode 1

to BUCK traditional gender roles
like that.
The Big Bang Theory Season 11, Episode 17

Buck up, sissy pants.
The Big Bang Theory Season 5, Episode 1

and all you've got is "Buck up"?
The Big Bang Theory Season 5, Episode 1