Definition of liplock:
(n) :
(chiefly US, informal) A kiss or the act of kissing; especially a long, passionate kiss.
(n) :
(fishing) A maneuver in which a fish is hooked by a curled finger inserted under the gill cover and extending to the fish's jaw.
(v) :
Alternative form of lip-lock. [(slang, chiefly US) To kiss for an extended period of time.]