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1.
How you present yourself in the meeting of a new person.

Most people look back on these and wish they'd made a better one.
"Jesus fucking Christ, Kate, you should've told me your parents would be there. I would have worn more suitable clothes to give them a good first impression... You really fucked up my evening."
by Hayley Hogsworth December 30, 2005
 
2.
Breasts.
She's not got the right skill set and her CV is a bit thin, but I'm giving her the job based on the great first impressions
by Sophie Wit-Tank February 05, 2010
 
3.
the first impression is basically a thumb print (using your thumb to massage/penetrate a woman's anus) with a little spice added, stealthily slipping an ecstasy tab in with the thumb, to increase the sexual experience for the woman
"Damn Brian, that sex was amazing, thanks for that First Impression"
by buddah April 17, 2006