Perfect Month 

A month whose 1st date comes on Monday and all the Sundays in that particular month follows the date pattern of 7 14 21 28 is known as Perfect Month. The name Perfect comes from the fact that it follows table of 7 which is the number of days in a week. Also, monday is considered as the first day of the week, hence coming of monday on the 1st date of a month is considered as Perfect Month.

Sam: This month is pretty busy, the work load is so damn heavy. I can't wait for weekends.
John: Sam "When sundays are coming this month".
Sam: Its a Perfect Month.
John: Man, weekend will be coming so damn late.

Perfect Month by Reet Awwsum June 10, 2013

The perfect month 

Getting laid every day in a month by a different girl each day.

Barney Stinson accomplishes this in the last episode of the beloved tv-show; How I met your mother.

Barney: -Remember when I banged 7 girls in a week.
Lily: -Yeah, the perfect week.
Barney: -I just accomplished the perfect month

The perfect month by TorgeirAK March 11, 2015