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Technically it means "you must":
Encarta(R) World English Dictionary [North American Edition] (2009) http://encarta.msn.com/dictionary_1861695874/get.html

So it means more of an obligation than...

Well again he is telling an exaggerated lie. In this case "estate" refers to Elvis's property known as Graceland: http://en.wikipedia.org/wiki/Graceland and http://ru.wikipedia.org/wiki/%D0%93%D1%...

In case the context is a ZZ Top song, then I think "Trigger" is the name of a horse (of course the guy is lying about himself):
Give It Up lyrics http://www.elyricsworld.com/give_it_up_ ......