
Whatever, DUDE. The point is
Leonard's got one and you don't.
The Big Bang Theory Season 3, Episode 2

Dude, I'm glad
you finally got a girlfriend...
The Big Bang Theory Season 3, Episode 15

Sitar music for her ringtone is not cool,
DUDE.
The Big Bang Theory Season 4, Episode 19

Dude, it's called breakage, okay?
Breaking Bad Season 2, Episode 5

He's got awesome tattoos.
Dude, he's got a hot girlfriend, too.
The Big Bang Theory Season 9, Episode 10