A runner who is hyper focused on hitting high mileage. A mileage merchant will often make sure to let others know about their high mileage.
John always runs an extra few minutes to make sure he has the highest mileage on the team. Why does he always have to be such a big mileage merchant?
An estimation of a females’s amount of past sexual partners, intended in a derogatory, judgmental, ignorant, and hypocritical manner.
Bro 2: Yo, you planning to have sex with Guadalupe, bro?
Bro 1: Yo, no way. She's had way too much gash mileage, bro.
A thing where lunatics will voluntarily spend money to travel on airplanes to accumulate frequent flyer miles but without actually leaving an airport. This often consists of multiple legs flown subsequently, often over the course of several days.
Bhargav spent his weekend going on a mileage run to hit his airline's top tier status. He flew to Dubai and back but never left the airport.
The absolute furthest you can go in a limited amount of time, such as on lunch break or weekend. Place can be a nice restaurant far away, or a far weekend destination
'Do you want to go to that hamburger joint by dearborn and michigan?'
'dude, that's so far!'
'it'll be a mileage run'