2H = I have hearts 2S = I have a strong hand, do you have extra points/suits? 3H = no, nothing, let me play just 3H 4C = but I don't have hearts, I have a very strong hand with clubs (too strong to bid a NF 3C after 2H, and too weak to rebid 5C now) pass = OK, but I don't have one trick for you, so, try to make 4C Treating 4♣ as cuebid for hearts is just bizarre. The auction after a opening from opponents should be inclined towards bidding right games/partials and not speculative and thin slams.