1. A group, gang, or other collection of males who attempt to round up, lasso, or otherwise capture hot, young, and unblemished females for the purpose of sexual activity.
2. A group, gang, or other collection of males who attempt to round up, lasso, or otherwise capture, hot, young, and unblemished dam-building rodents.
The prettier 8th grade girls were always worried that one of the neighborhood's many beaver posses might catch and fuck them on their way to school.