Sentence:  “Oh, God stop, stop,” Kat said, holding her side, “I'm starting to prairie dog.” ... “You know, <WSD>prairie dogging</WSD>,” Kat said, trying to explain between breaths. “When it pokes its head out of the hole and then back in, out and in, out and in.” 
Meaning of the word marked with <WSD> tags:  To struggle to hold back an involuntary bowel movement.