Boy, if good ideas came out of your brain
the way MUCUS comes out of your nose,
The Big Bang Theory Season 10, Episode 19
"MUCUS plug" again.
The Big Bang Theory Season 11, Episode 16
Can you go to the kitchen and get me
the turkey baster labeled, "Mucus"?
The Big Bang Theory Season 1, Episode 11
Has your MUCUS plug popped out?
The Big Bang Theory Season 11, Episode 16