When having doggy-styled
sex, you replace your penis with a beer bottle (or perform anything totally unexpected and/or vile), thus prompting her to give you an incredulous look from
one side of her face.
Since her back is facing you, she couldn't spin her head completely around to give you that look (unless she's Megan from The Exorcist), thus resorting to face you with one side of her face, looking like a
fish laid
flat on one side.
When used in the context of man on man action, it can be re-worded to One Eye Lance
Bass. A dedication to the out-of-closet NSync member.
While doing it
doggy style with my girlfriend, I ejaculated into her without prior
consent. She gives me the one eye
bass, and proceeds to kick me in the nuts.