to throw someone to the gound and beat them with great force and step on them repeatedly. this is usually very painfull (pending on who is doing the beating) but can also be very funny under the circumstances.
1. A romantic interlude spanning more than 3 hours.
2. A romantic interlude consisting of multiple attempts at and completions of sex. Note: The use of E.D. remedies (Viagra, Levitra) will re-categorize the acts and the term clobberthon no longer applies. See "Bob Dole on a Roll"