a breast behind everybody else

VicNicSor

Banned
Russian
In a restaurant, Susan and Steve are going to date and they want Jeff, their friend and her ex-boyfriend, to leave. But he won't. She is joking then:
SUSAN: Yeah, what do I have to do here, beg? Show you a breast?
Jeff takes it seriously and insists on her flashing him. Four more friends of Steve's and Susan's hear that exchange and all ready to see Susan's breast too, each having their own reasons. Even Steve joins them.
STEVE: Just in case you do do it. You know, technically I'm on a date with you. I don't want to end up a breast behind everybody else.
Coupling, TV Series

Could you parse the boldfaced phrase grammatically please.
Thanks.
 
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