To trip and stumble at the same time.
Also n. A cross between a Tribble and a Womble... a creature that breeds like mad, but always cleans up after itself.
"What do you suggest we do Scotty?"
"I say give 'em a brush and shovel, and some mood music and leave 'em all to it!"
From "The Trouble With Trimbles" Start Wreck, Season 2.