What is All Up In That?
1.
the act of satisfying another's deepest needs / physically supplying themselves to stimulate their comfort zones to the point of physical fruition .
One who is "all up in that" is delivering physical pleasure in the deepest and most personal of ways. They are doing so repetitiously and very intently.
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1- Someone that pretends they dont know their friends anymore when they get around "more important" people. The Big Leaguer is..