Top Definition
One who refrains from drinking, smoking, and etc. in order to act as the brains of the situation.

Some may consider this person as "the lame one", when he/she (the designated thinker) really just want to be responsible and lookout for the well-being of others.
1. Drunk friend: "I am soooooo gonna go home with that sexy guy over at the bar."

Desginated Thinker: For goodness sake, he could be a serial killer and you're thinking about going home with him? Sit your ass down, you're not going anywhere.

2. Random drunk guy: Why isn't that guy over there drinking and having fun?

Random drunk woman: He's just being the designated thinker, making sure no one gets their ass into trouble.
by song_bird2103 February 02, 2009
6 Words related to Designated Thinker

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