square down
When you're so heated and amped up about confronting someone that you accidentally fuse "square up" and "throw down" together.
I can't wait to square down with Sally after she tried to put me on blast over my vector space model implementation during the meeting.
Square down
When a female assumes the position atop a Male sex partner just prior to inserting his dong into her snatch.
Dude, your mom had just started to square down on me when I thought about your sister and shot my batter bullet straight up her nose!