The intransitive usage of "satisfy"

Popularly, this use of "satisfy" is seen in the Snickers slogan: Packed with peanuts, Snickers really satisfies
At least since 1986.

I always heard the advertising slogan simply as "Snickers really satisfies."

v.i.
10. to give satisfaction
Random House Kernerman Webster's College Dictionary

v.intr.
1. To be sufficient or adequate.
2. To give satisfaction.
American Heritage Dictionary

verb (used without object), satisfied, satisfying.
10.
to give satisfaction
dictionary.com

intransitive verb : to be adequate : suffice; also : please
Merriam-Webster Dictionary

And lastly from the OED with quotes starting 1600. My thanks to Mitch for adding these to my answer:

5.absol. and intr.
To cause or give satisfaction or contentment.

1600 Chester Pl. Proëm 44
If the same be likeinge to the comons all, then our desier is to satisfie—for that is all our game.

1649 J. Winthrop Hist. New Eng. (1825) (modernized text) I. 210
This would not satisfy, but they called him to answer publickly.

1831 Westm. Rev. Jan. 243
What would have satisfied from the Duke will not satisfy from Lord Grey.

1836 R. W. Emerson Nature iii, in Wks. (1906) II. 145
But in other hours, Nature satisfies by its loveliness, and without any mixture of corporeal benefit.

1903 Heart of Heretic vi. 33
The first and last need of an aspect of religious truth is that it shall satisfy.

American Heritage has two meanings listed for the intransitive form:

1. To be sufficient or adequate.

2. To give satisfaction.

The first is similar to suffice and the second is a little bit like suit.