The feeling an individual gets when they are pining for a member(s) of the opposite sex. This affliction is usually defined by the fact that its inception occurs based on the length of time since the individual last saw a member of the opposite sex. The yearning involved with mocus is defined strictly as a longing for sex or physical comfort. This word is usually reserved for the backwoodsmen and foresters of the the Northwest.
Ben got the mocus so bad on a camping trip he humped a log to splinters.