pct=Post cycle therapy meaning the time and compounds you take right after a cycle. e.g. a SERM (see below) test booster, AI (aromatase inhibitor).
SERM (selective estrogen receptor modulator) e.g. Nolvadex, clomid, toremifene) used to prevent breast cancer or in our case used to block estrogen from binding to its receptor. this compound will help prevent "bitch tits" and let natty (natural) test come back into normal levels along with the decrease of estrogen.