bum-ble  [buhm-buhl] verb, -bled, -bling, noun
-verb (used without object)
1. to bungle or blunder awkwardly; muddle: He somehow bumbled through the crowds into Steph's arms.
2. to stumble or stagger: He bumbled out of the pub.
3. to speak in low, stuttering, halting manner; mumble: He bumbled and mumbled under his breath after too many beers.
-verb (used with object)
4. to do (something) clumsily; botch: He bumbled together a plan for tonight's drinking.
-noun
5. an awkward blunder.