Back may come in the senses of "backward/behind/rear" and one of its antonym could be "future"http://www.thesaurus.com/browse/backWait! Isn't Lincoln already a luxury brand?
Well, that's kind of the issue. And the reason why the brand has gone with McConaughey — who may have played a lawyer doing business out of the back of his old-school Lincoln,...
(the backward part of the car-Lincoln)
Source: Business Insider
The goalkeeper spent a lot of his time picking the ball out of the back of the net.
(the "out of the back of the net" na parte de trás da rede...no fundo da rede)
On the Wordreference they translate into "when you are lost in the past", makes sense.http://forum.wordreference.com/showthread.php?t=1490447