The first chunk is what the public wanker is doing (wanking in public), the second chunk is what he's fantasizing (showing the bird how big his prick is and she's in awe) and the third chunk is remembering how the birds aren't feeling his "big" prick but in fact alone (Got me talkin, but nothing's with me)
The first chunk is what the public wanker is doing (wanking in public), the second chunk is what he's fantasizing (showing the bird how big his prick is and she's in awe) and the third chunk is remembering how the birds aren't feeling his "big" prick but in fact alone (Got me talkin, but nothing's with me)