‎What does H's mean?

"I got a pocket full of H's, and I'm not afraid to use them"

All context

-Did you hear about that?
-No.
-So, okay, listen.
- When I was growing up --
I mean, I am 17, but when I was like...
Really, like 5 or 4 or more or 3 -- I don't know.
I used to watch a show called
"The Electric Company," and -- [ Laughs ]
There was a guy on it,
and he had eyeliner,
and he was singing about H's
'cause it was, like,
a little kids show,
and he was like --
the hook was like --
What is it?
It was like "My H's," like...
Something, something, nothing --
I don't even know what it was,
but it was you, and then
I remember seeing you on TV,
and I was like,
"That's the guy
from the commercial
with the H's."

-It's such a long career.

-I got a pocket full of H's, and
I'm not afraid to use them.

-Yeah, pocket full of H's.
It was like a Ramones
type of song.

-And it was you!
-♪ I got a pocket full of H's,
and I'm not afraid to use them ♪
But no one saw that
in my whole lifetime.