1. A person whose name you can't seem to remember.

2. A person whose name you don't care about enough to try to remember.

3. A person whose name you can't seem to remember because said person is much like several other people whose names you also can't remember.

4. A person who is simply unworthy of a name.
Example 1:
That girl. With the hair and the eyes and the mouth and the face. You know, Whoosit.

Example 2:
I know her, but I'm going to pretend that I forgot her name because I'm cool like that. "How's it going, whoosit?"

Example 3:
That girl. With the hair and the eyes and the mouth and the face. The one that looks just like that other girl with the hair and the eyes and the mouth and the face. You know, Whoosit.

Example 4:
"What did you say that guy's name was again?"
"Oh, him? He doesn't have one. He's just a whoosit."
by Sadie-Sometimes March 16, 2010
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1. Any item, one hundred percent nessessary to get you where you need to be. Mentally or physically.
2. A slang word for toilet.
1.a. No, I need to pick up another whoosit at the hardware store before we can finish this job.
1.b. I need a whoosit for my whatsit, you dig? (a bowl to smoke this pot)
by Jaime W. August 13, 2003
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