pinch and a punch for the first of the month

Meanings

1. Said on the first day of a new month, while pinching and punching someone as a prank (especially by children). The victim may respond with "a flick and a kick for being so quick" and the original attacker may reply with "a punch in the eye for being so sly".
2. More generally, a pair of attacks or setbacks at the start of something.