Nobody's going to ask about last night
as long as you just ZIP your lip.
The Big Bang Theory Season 4, Episode 6
See, that's got
some ZIP to it!
The Big Bang Theory Season 12, Episode 18
Now ZIP me up.
The Big Bang Theory Season 5, Episode 21
...until one of you breaks down
and moves to another ZIP code.
The Big Bang Theory Season 1, Episode 3
That you promise to ZIP your hole
for the next eight hours.
The Big Bang Theory Season 2, Episode 21