The character was raised around a bunch of rough guys (or just one) and usually is thus dysfunctional in normal society, especially around women. The trope may use an exaggerated, Testosterone Overdosed version of masculinity. This situation can be seen as overall positive for a male character as it can only make him "manlier". However, a girl in this situation often becomes One of the Boys or The Ladette and, in some cases, may never be seen as a true woman for lacking the mandatory Acceptable Feminine Goals. In milder cases, I Have Brothers may be invoked instead.