The large light display appeared at the front of a home on a quiet residential street in Reading, Berks., yesterday.
It is believed to have been put up by a group of students living in the house.
Stephen Bailey-Todd, 53, who lives nearby was in "complete disbelief" when he spotted the bright shining phallus while out on a walk.
He said: "It was quite a shock to be honest. When you walk home you just don't expect to come face to face with an enormous penis on a wall.
"The lights were flashing and it is so in your face, you cannot help staring at it.
"I was in complete disbelief.
"I know young people like to have fun but it's deeply offensive and shows a lack of respect."
The dad- of-one added: "I would hope that if they are students, their university or college takes some form of action against them.
"It's not the sort of thing you would want a child to see."
The display was put up only a short walk away from Reading University.
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