the noise one hears while casually walking down the street and is pulled over by a cop, usually with no reason. the whup whup noise is the siren being turned on for a brief period. is also heard in other police situations, although this is the most common.
friend 1 to friend 2: that bar was awesome! im glad we decided to walk home though, driving is dangerous and cabs are expensive
cop: *whup whup* excuse me gentlemen what are you doing out this late? can i see your IDs
cop: *whup whup* excuse me gentlemen what are you doing out this late? can i see your IDs
by freedomman5000 July 2, 2011