For those not au fait
with this dubious American contribution to culture, two of a kind and full house allude to the game of poker. If you can't play, don't learn! The rankings of poker hands in ordinary high only games is as follows: 5 odd cards, one pair, two pair, trips - also known as a set, three of a kind or a prial, straight or run, flush, full house, four of a kind - also known as quads or pairs royal, straight flush or running flush, and finally a Royal Flush - 10, J, Q, K, A in the same suit.
In most variants of poker, the strongest hand a player is likely to be dealt in a session is a full house. Two of a kind - i.e. one pair - is a fairly weak hand. The title of this song suggests, obviously, that the pair will hopefully be augmented by maybe as many as three offspring.
Alexander Baron - London, England