An alligator reacharound is where a person comes up from behind and grabs a man's dick and balls and twists them as hard as possible.

The act of jerking off another man or woman from behind using a hotdog bun

The act of getting sick of all these mothering fucking snakes on this mother fucking plane, then punch a hoe while forcibly making her jerk your pee-pee monster.

While it also describes a sex act, a reacharound can also refer to when something or someone applies something so extremely, they come back around to do the opposite. Usually done either ironcally, spitefully, or unintentionally.

when you are receiving a harmless reacharound and just before you nut, they jam a thumb in yr land down under and they scream good day mate

A regular reacharound except you're both hanging upside down. Sometimes called the Auzzie Roundabout. It doesn't have to be homosexual, you can do this with a man or woman and sometimes you can switch roles, but role switching would involve a strap-on depending on the gender of those involved.

The Tijuana Reacharound is when you hook up with a girl and while giving you a hummer she steals your wallet