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The actual act of sexual intercourse, man-to-woman; woman-to-man. When I was young (many eons ago) they had the 'base' system:

1st base: kissing and maybe some 'under the sweater' action
2nd base: french kissing and fondling
3rd base: naked bodies rubbing together, but NO penetration
4th base or home run: sexual intercourse

It got stupid to say 4th base and saying home run during baseball season could be confusing. So the act bacame The Big Nasty.
Susie: Did Johnnie feel you up last night, Nancy?
Nancy: No Suze, we went all the way. Enjoyed The Big Nasty, donchaknow.
by Shmouse May 23, 2005
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Anal-oral contact, also referred to as anal-oral sex, rimming, or anilingus (from anus and lingua), is a form of oral sex involving contact between the anus or perineum of one person and the mouth of another. AKA - The defined art of butthole pleasures.
Angie: "That corn was really good."
The Big Nasty: "Boy, I would suck a fart out of her ass."
by The Big Nasty / L-Money April 12, 2009
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A process that used to be used back in the day by call center agents supporting cable modems. It was a long, multi-step average handle time killer that included ripping out Windows' TCP/IP components, removing and re-installing network drivers, deleting the related entries from the registry, deleting some Windows system files that were frequently corrupted, restoring the system files, rebooting a few times, getting up and doing the chicken dance on your desk, calling the Mentor Line a few dozen times and guzzling lots of coffee. Always done as a last resort, usually at the recommendation of a mentor.
John tried ripping the stack and the nic, but that didn't work so he just did The Big Nasty and that got her back online.
by Majik Fox October 28, 2004
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1) somone with a small flacid penis, or other genetalia. 2)prepubescent fat kids.
a) The Big Nasty Couldn't even tickle the girl.(in bed) b) logan touched the big nasty.
by bound behemouth December 25, 2005
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