MNOP Views 6 meanings found MNOP is the abbreviation for mono‑N‑octyl phthalate, a plasticizer studied in chemistry, and is also used informally online to advise someone to “make no other plans.” Miscellaneous Mail Network Optimization Project Marc Nelson Oil Products Many New Original Promotions International MusiqueS Nouvelle Orléans en Périgord Academic & Science Mono N- Octyl Phthalate Internet Make No Other Plans