To chill out especially hard, or to be especially focused on the act of relaxing. Used most commonly in instances of marijuana use, or other relaxant drugs.
1) "What did you guys do last night?"

"We smoked some weed, played video games, listened to music, etc. We were just Treyin' face."

or

(Looks at high person relaxing on the couch) "Check it out. Michael's Treyin' face right now."

or

"Dude, just finished up exams. I'm about to be seriously Treyin' face."
by TresFresh June 30, 2013
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