Oh boy, whatta maroon.
I'm pretty dense, but when a gal asks you out for a drink (especially a girl that you want to get to know better), well, then you go out for a drink.
Men are so dazed and confused from years of trying to interpret the litany of mixed signals from a myriad of different women that when a clear signal is sent, we tend to short circuit ourselves while searching for the "deeper meaning."