Patrick is a pink starfish who wears lime green shorts with lavender flowers on them. He is SpongeBob's best friend and lives under a rock, literally, on 120 Conch Street, two doors down from his best friend, right next to Squidward. Patrick spends much of his day sleeping under his rock. He is an unintelligent, pleasant starfish who is quite overweight and loves to eat ice cream and many other junk foods. He and SpongeBob tend to bother Squidward with their games and leasure time. Patrick is portrayed as overweight, lazy, unmannerly, unintelligent, and generally ignorant. He has trouble with even the most rudimentary tasks and displays little common sense or intelligence. Patrick's memory can be appalling and he can forget how to do the most instinctual of actions such as eating or how to fall over. He once forgot that he ate a candy bar the second after he consumed it. Other times he can appear almost brilliant, and is prone to fits of temporary intelligence which confuse the other characters. Squidward once asked Patrick "Just how dumb are you?" to which Patrick replies "It varies". This seems to rane true as even when shown being dumb, Patrick still appears to be somewhat intelligent, often making profound comments and being very articulate. Patrick seems to detect malice and sarcasm more easily than SpongeBob, indicating that he is more attentive or emotionally connected than other characters. He also displays witty banter at times and often can be sarcastic. Patrick is generally well intentioned but often inadvertently causes trouble both for himself and also his friends.
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http://spongebob.wikia.com/wiki/Patrick_Star
Patrick being stupid