Sexual act; penetration of the ear. Resulting deposits in ear may result in hearing problems, hence 'soundproofing'; to ejaculate in ones ear.
Damnblud, yo just penetrated my ear, AND ejaculated in it, therefore I have been, like, totally sound-proofed.
Pardon? You'll have to speak up a bit, I was given the soundproofing to end all soundproofings the other night. Sorry, could you pass me those cotton swabs? Still got some... semen... in here...
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).