Originally this means your currency is not acceptable, but in common usage it means 'we won't accept your money' (because there's no charge, or somebody else is paying for it) picked us up= seems like Kent cheered them up emotionally, but I'm not sure of the exact context. Maybe he wrote a positive article or did some heroic action.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.