The act of touching oneself to the thought of their significant other.
My girlfriend has been gone away on business for weeks now, but I still think about her all the time. Especially when I'm bae-ting off at night.
When you and your friend beat each other up until only one person is left, in order to get the girl.
"yo u like her and i like her??? meet me in the bathroom after school!!!!"
"what, is it a bae-off now? go suck ur own dick."