No, it's not the tomato condiment that you put on your French fries but the express train you ride in the hope of catching the local train you just missed.
Fuck---just missed my 6 train at Brooklyn Bridge. I'll take the catchup to 14th Street---maybe I can pick up the 6 from there.
When your friends have already had a drink, but you are just starting you are "playing catchup".
From the TV game show "Catchphrase", with the legendary Roy Walker.
Mate, you're late and playing catchup.
A business term referring business meetings on the go.
Let's catchup the proposal after launch.