I thought it was:
You can tell by the stink, that she isn’t in the pink,
When the end of the month comes around.
Now you have taught me a new verse.
Shouldn't that instead read, "When that time of the month comes around?"
I mean: Unless your woman's cycle is perfectly synchronized with the calendar, it's perfectly possible that her period might start mid-month, or towards the beginning, or anytime!
In any event: a fine anapaestic trimeter!
Regards,