From Longman Dictionary of Contemporary Englishpsych somebody up phrasal verb informalPREPAREif you psych yourself up or if someone psychs you up, you get mentally prepared before doing something so that you feel confidentpsych yourself up (for something) We both knew we had to psych ourselves up for the race. → psych→ See Verb table
Examples from the Corpus
psych up• Occasionally, nowadays, Irene is around to psych him up before he goes in there.• We went our separate ways, both recognizing that we had to psych ourselves up for the race.psych yourself up (for something)• We went our separate ways, both recognizing that we had to psych ourselves up for the race. 