Term commonly used when the term shit is just not strong enough. Derives from the fact that a block of shit is much denser, thicker and heavier than a normal piece of shit.
Mick: Oi John, 'ave you heard that new tune by Jennifer Lopez, i thought it was total shit.
John: Yeah me too, in fact I thought it was fucking blockshit!
John: Yeah me too, in fact I thought it was fucking blockshit!
by sixxon June 18, 2007