In the event that two bros “lock on” to the same target, the bro who calls dibbs first, has dibbs.
If both call dibbs at the same time, the bro who counts aloud to ten fastest, has dibbs.
If both arrive at the number ten at the same time, the bro who bought the last round of drinks has dibbs.
If they haven't purchased drinks yet, the taller of the two bros has dibbs.
If they're the same height, the bro with the longer “dry spell” has dibbs.
Should the dry spell be of equal length, a game of discreet rock-paper-scissors shall determine right of way — provided the chick is still there.