The alternate definition only tells half the story; this big-boned female will get a taste of the cock, but then her hunger will overtake her. She'll rip off the penis, chomp into the hip, rip off your legs and put 'em in BBQ sauce, then put the rest of you in a deep fryer.
What the HELL are you doing you hungryhippo? AUUGHH MY PENIS.... AUUGHHH MY HIPS.... AUGHH MY LEGS.... NOT THE DEEP FRYER...! AUUUUGHHHHH....
The Hungry Hippo is a sex position that is used when the girl is currently in reverse cowgirl ontop of the male and the male does a front flip so that the woman is now upside down whilst the male is on top pounding the fuck out of her, this is like a wrestling type move and should only be done if you think you can do it first time.
A sex act ,involving the man laying on top of the woman in the 69 position with his balls in the womans mouth . She then proceeds to jam her thumb in the mans asshole rapidly causing him to lunge forward ; mouth open towards her pussy like a Hungry Hippo.