When you slap your dick against her pussy before putting it in.

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)

When you're fucking a deaf chick from behind and you scream racist insults directly into her ears.

Making sure your sound is on point before you do a show. Faith Evans always do a soundcheck, about an hour before people come to watch her perform.

Asking for a Sound check is a different way to ask you co-pilot if you have any visually noticeable drug residue in, on, or around your nostrils. Usually after insufflating an illicit substance in powdered form.

An audible fart with no accompanying smell.

Basically if you rip one and someone hears it and it does not smell THAT is a sound check.