
Uh, no. We lock that door,
lower our UNDERPANTS a little,
The Big Bang Theory Season 10, Episode 8

It's where your UNDERPANTS live.
The Big Bang Theory Season 9, Episode 10

let all the boys see
my UNDERPANTS.
The Big Bang Theory Season 5, Episode 1

But I don't want to know
how many UNDERPANTS you own.
The Big Bang Theory Season 7, Episode 1

"Leonard will restrict video gaming
in UNDERPANTS to hours Penny is not home.
The Big Bang Theory Season 10, Episode 13