A bitch with two boners
A girl in a group of people having sex who can't decide which guy to go with first because she's got a full plate of hard-ons to choose from.
'She’s still arguing with herself about which guy to take first.'
'She can't pick between three guys because all of them have hard-ons and she's confused.'
'She's stuck between two boners like she's got a choice between two pizzas.'