plain and simple: when two chicks rub their pussies together by straddling one another. very pleasureable.
I know Mindy and Angela were donut bumpin' that bed was soaked.
by KroSS September 23, 2004
2 females engaged in a sexual act
I heard Joan and Leslie were donut bumpin' all last night.
by aka April 29, 2003
My gross pervert friend Daniel told me it was when one girl strattled another girl and the grinded their pussies against each other or something. Kind of like dry sex, only not so dry! Yucky huh?
"You look totally flushed...you were SOOO donut bumpin' all night!"
by Anonymous April 30, 2003