When a woman's boobs aren't aligning in her bra properly so she has to adjust them.
"This bra is fitting me weird...FRONT-END ALIGNMENT!!!"
When you are wearing a pad and you are unsure of whether or not the menstrual flow is hitting the pad properly, so you adjust the positioning of your vagina to ensure proper target alignment (aka the blood is going on the pad and NOT your pants).
Oh man...it totally feels like my pad is off to the side...TARGET PRACTICE!!!