Top Definition
b.o.b.-a-thon: when a girl comes home from a hard day and takes a nice long bath, then proceeds to have a marathon session with her favorite vibrator. Includes multiple orgasms over a 2-3 hour period.
Sunshine: So what'd you do last night, Katie?
Katie: I had a b.o.b.-a-thon, and I feel so much better today! I was at it for like three hours! Six orgasms and no stress today baby!
by KatieZ1983 September 10, 2008

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