It's when after an episiotomy, a girl shits out of her vagina while you're eating her out.
"I went down on this girl I've been dating and wow she had a California Volcano Burger waiting for me"
by J.D. Ross August 01, 2008
where a girls vagina is messed up because of having her taint cut during child birth thus making her butthole and pussyhole one and causing her to shit out of her vajayjay
Damn I went down on my girl last night and she had the runs and gave me a California volcano burger
by Mark Dang August 26, 2008