what does"Be down for the cause, be my misses set it off, she can add to the po-po-po,had some Betsy Ross" mean?
In the context of the rest of the lyrics....he is saying that out of all the things the club can provide him....drinks, music, dancing...etc....the main thing he really wants in the club, the club itself does not provide as a direct service...getting laid.
As most young men tend to do, he has made this his cause....and he then lays out his plan to a young woman....asking her to assist him in achieving his objective, by
1. Promising to buy her drinks, if she is receptive.
2. Her understanding of the fact that he needs sexual gratification, as this has become his goal for the night.
3. Her agreeing to be the recipient/participant of said sexual activity, and to not be shy about it, perhaps even being the initiator.
4. Asking her not to talk too much.
The reference to Betsy Ross; a revolutionary war seamstress, who might have created the first American flag, or at least helped in it's initial stages....I do believe is simply used because her name somewhat rhymes with cause/clause. Perhaps there are some deeper underlying meanings in the lyrics that could be alluding to various other well known themes of the revolution....the birth of a nation, the shot heard round the world, the founding fathers, or even a bicameral legislature.
Though I believe that her name is used for poetic purposes only, I would be glad to mull this over if you feel it is warrented.
He states that he would also like for his friends to get laid, indicating that he is a team player, and not completly self absorbed....he also states that he will have nothing to do with a Dr that has bad handwriting, and he asks the young lady if she could spit for him, to check her salavia for mucus...perhaps he was a pre-med student before becoming a singer, or is simply mysophobic.