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1.
In sports, a person who judges a player by his per-game stats without accounting for his team's pace of play. (A Pacist gives preferential treatment to players on teams that play at a faster pace because of the higher per-game stats produced.)
Jason King demonstrated that he is a Pacist when he did not name Mike Scott in his list of nominees for the John Wooden award despite Scott's impressive impact on a per-possession basis.
by Faz d' Hoo January 13, 2012
 
2.
Anxious about being horny or having an erection in public.
As seen in the song "Its getting hot in here" by Nelly: "Good Gracious/ got be so pacist"
by ManLaugh25 June 25, 2011