Lyric discussion by ghosty17 

It's about a girl who used to be crazy. Absolutely wild, going to parties, clubs and dressing trashy to get attention from boys. She craves sex and therefore is just known by the girl who will do whatever and whenever. Now, she has settled down after she got pregnant, "that bloody mary's lacking her tabasco" means that she skipped her period. It's unclear whether she ends up with the guy (slag) who impregnated her, but it is clear that whoever the guy was, was inadequate. She felt the need to settle and settled the guy who was easiest to get and now is just getting action in her nightdress, reminiscing on being young and free. Trying her best to be happy with such a guy, and her conditions.

@ghosty17 I commented something kinda like this explanation too

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