Probo-bably lassoed something his size, such as a teensy prairie dog.
6 seconds sound clip from Snagglepuss - Diaper Desparado (S1E13).
You can hear this line at 00:04:08.245 in the Blu-ray version of the episode.
Quote context
[...]
- And I am a lowdown, mangy, polecat coyote of a wild steer whom you lasso.
- Yeah, yeah, yeah, yeah, yeah, yeah.
- Exit, stampedin' all the way, stage left.
- Why hasn't my stampedin' been impeded?
- Probo-bably lassoed something his size, such as a teensy prairie dog.
- Let me have the rope, and I'll haul the critter in for ya.
- Heavens to hamburger. It's a for-real bull.
- Mooo!
- Exit, cowardly matador fashion.
- As my western pal, Quick-Draw McGraw, so aptly puts it: Ooh, that smarts!
- In this lesson I'm a no-good rattler of a bandit a-hankering for a heap of trouble.
- Fast on the draw and slow on the sympathy.
[...]