Watch Slasher Weekend Full Movie Free Online 123Movies. Jenny is leaving on a trip to see her gay boyfriend Johnny, but Johnnies boyfriend Alex is very upset after being blown off by Johnny for his girlfriend so Alex grabs a knife and makes plans to get even. Meanwhile Jenny's Daddy has a thing for his daughter and keeps fondling her causing Jenny to get very upset as well. Meanwhile Jenny's boyfriend Aaron crashes the party and wants to go along but hates Johnnie with a passion and threatens to kill him and meanwhile there is a knife wielding monster that wants to kill everyone for no apparent reason. See it to believe it!