The activity of hurriedly getting rid of the browser history before your wife goes on the laptop - therefore nullifying getting into serious trouble when your wife finds "midget sucking off a donkey dick".
Forgetting to History Blast can result in divorce, violence and in some cases, prosecution. See Gary Glitter for details.
However, History Blasting only works alongside "Innocent Browser History Restoration" (IBHR) where the individual looks at mundane pages like the weather, football results, funny cat videos and questions like "can dogs smell farts before they come out" so as to cover up the period spent furiously wanking over Brazilian Scat porn.
How's Dave?
Not good - he forgot to do his history Blasting and now his wife wants a divorce.
Silly cunt. Should have History Blasted