He's referring to an ACTIVITY
he has done before.
The Big Bang Theory Season 2, Episode 15
It's interesting but isn't ventriloquism
by definition a solo ACTIVITY?
The Big Bang Theory Season 2, Episode 13
The state requires you to suspend
all ACTIVITY
Breaking Bad Season 4, Episode 3
I have no desire
to engage in the ACTIVITY.
The Big Bang Theory Season 4, Episode 20
It's a laborious ACTIVITY
because I have to imagine what you need...
The Big Bang Theory Season 1, Episode 16