To be used in replace of and in conjunction with the term paperbag. Generally speaking, if you are under the influence of alcohol you are much more likely to lay a paperbagger without having the wherewithal to put the paperbag on. This constitutes a hammerbang. The term encompasses all kinds of people, men and women, that you would otherwise not bang if you weren't hammered.
Anthony: Would you date her?
Cameron: Fuck no.
Anthony: But will you bang her again?
Cameron: The best shes getting from me is a hammerbang, if shes that lucky.
Anthony: So you regret it?
Cameron: Not really man, DIFTS. Shes the epitome of a paperbagger or hammerbang, how many of you can say you've done what I've done?