In dictionaries:
carpool lane
Synonym of high-occupancy vehicle lane
Carpool Karaoke
a recurring segment on The Late Late Show with James Corden, in which host James Corden invites famous musical guests to sing along to their songs with him whilst traveling in a car driven by Corden on a planned route usually in Los Angeles, usually under the pretense of needing to get to work and preferring to use the high-occupancy carpool vehicle lane, or the pretext of needing directions from a local when in a new town, such as London (with Adele), Liverpool (with Paul McCartney), New York City (with Madonna) or Las Vegas (with Celine Dion).
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