To go about forcefully, to do much, much more than is needed. To achieve a result without any regard for damage done while getting there.
Person 1: Dude! You just mantrucked that bathroom! What did you eat?
Person 2: Three bags of Flamin' Hot Cheetos
Person 1: Look at all that food you have, you mantrucked that buffet!
Person 2: I'm hungry...
Person 1: Dude, come watch this porn, this girl is getting triple penetrated
Person 2: Whoa, she's being mantrucked.
Person 1: So how long is the hike?
Person 2: About 20 miles...
Person 1: Dude, we better get mantrucking.