Get on the back half of that motherfucker

Embracing an unmissable opportunity such as how a Munted Gunty may feel the need to take a massive dildo all the way down to the base, i.e. the back half.

"Get on the back half of that motherfucker" said Dick Rangah when he realised that the petrol at the local servo was on special.

Or.....

Tom Cruise was so horny for some ass action that when John Travolta walked past he couldn't resist getting on the back half of that motherfucker.