Jabberstab - You stab someone's mouth with your finger when they're yawni

You stab someone's mouth with your finger when they're yawning because you're a rude, loud, mouthy person.

I jabberstabbed my neighbor when he yelled at me for mowing my lawn.

At the park, my sister jabberstabbed a kid who stole her ice cream.

My dog jabberstabbed my dad when he tried to eat my sandwich.