Lyric discussion by loveisfiction 

Cover art for The Preyingmantis lyrics by Porcelain and the Tramps

And as far as the meaning she is relating back to a time when he needed her ["I remember when you used to call me your baby"].. she took advantage of him [like a Preying Mantis], "I hung you on a limb" meaning she put him in a hard position to be in, yet he didn't mind it so much. Now she's telling him it's over and he's asking her not to go ["crying on my shoulder". But to her it's as easy as just "washing him off in the shower", ie. the relationship going down the drain.