Afrikaans, but find that it is easier to type in english since you end up with so much slang when using afrikaans that you are not doing the language any favours. Any technical litrature (and maybe even to some extend aquariums) is just so much easier in english. I'm in IT (now who would've guesed) and I type a mail to all afrikaans speaking people in english. If you start talking about "bedieners" and "rugsteun" etc. most IT people will not have any idea what you're on about.
Multilingual, mainly English, but most of my mates are Afrikaans, and i can speak a little isiXhosa too (helps when living in the Transkei!)
Mooi man ek like dit kwaai as n daar so veel afrikaans sprekendes is but like they say te veel slang woorde so we type in english
Hey Wito sort of english you mean Ek is heeltemal tweetalig maar ek nie afrikaans praat nie --- I also speak VB, C and Pascal badly, and Ladder, CSF, STL fluently I can swear in about 20 languages and speak Chilapalapa (Fanagalo) ook as well