some one who has no sense of personal space and sticks their stupid face really close to yo whilst talking, even though you may not know them very well.
chap 1) met the new guy, dude?
dude 1) yeah, bit of a personal space invader, huh? all leaning in and breathing on me. Freak.
by Beat-shaman April 25, 2006
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A person or pet who invades one's personal space. A person who stands unnecessarily close when they talk to you or just in a place with lots of room. A kid or pet that follows you around very closely so that whenever you change direction you bump into them or step on them.
?I was shopping with my nephew the other day and he was behind me every time I turned around. He was being such a personal space invader."

My dad is such a personal space invader! He stands right up close to you when he's talking to you. It makes a lot of people nervous.
by KTDigs July 11, 2014
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A game invented for when you are incredibly bored and have no resources available to you to play a game (such as a ball). It involves two players which similtaniously have to invade each others personal space, such as waving their hands infront of the opponent's face or almost licking their necks.

The game is won by causing your opponent to flinch or deliberately move out of the way of your attacks. However, you can loose by touching them accidentaly.
John: Lets play Personal Space Invaders.
Mike: Yeah, alright.
by Trucast January 3, 2007
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The rare and abnormal act undertaken when a person who you have never previously had any aquaintance with, sits next to you in a situaiton when all of the other places to sit down are empty, like in a movie theatre or a bus.
Tom: "Hey man how was your movie?"
Craig: Man, it was shit i had to deal with a personal space invader the whole time!
by Red Cheeks Paul May 21, 2009
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