Most notably mentioned in the song,
"Before He Cheats"
by Carrie Underwood.
Bathroom Polo refers to some establishments (restaurants, hotels, etc.) that have a collection of cologne in their restrooms. Usually these are small trial sizes for sale in a dispensing machine. Since Ralph Lauren's Polo is one of the most well known scents for men, the reference
"Right now he's probably dabbing on 3 dollars worth of that
bathroom polo.
.
