A female, typically under the age of 30 who loves to publicly exhibit her armpits when excited in some way by pumping her fists into the air while shouting WOO! (sometimes WOO WOO). Whilst alcohol is a typical prequisite to becoming a WOO girl, it is not required.

a female who is often found going 'WOOOOOO!' in public. this behaviour is most often exhibited while in the presence of other woo-girls. it is speculated that this is a mating call used to attract men of less than average intelligence. this behaviour can most easily be observed in bar districts, at maroon 5 concerts, or spring break destinations. also, woo-girls are known to have an affinity for chads.

the female version of a dude-bro;
Dooney&Burke wearing, always down to play beer pong, ugg boot tucked into Victoria Secret Pink pants in public, fake nail/fake tan kind of girl that will most definitely put out at any party
Known for their mating call which is a loud "WOO!!!" whenever they have any amount of alcohol intake

n. 1. A yeah dude in female form

2. a girl who shakes her ass and goes "woooo" when she gets a drop of alcohol in her