Hehe that would've hopefully just gotten you a giggle and maybe some impressed looks from your boyfriend that you'd been able to find such an expression. It was also meant as a lesson to you to be careful what you get on the internet.
If you sincerely want to learn Afrikaans, you'll have a very hard time in WI and would be better off looking for Dutch lessons. After a couple months learning Dutch, Afrikaans will look like childsplay to you. My husband has that Teach Yourself Afrikaans book that was recommended to you on Yahoo! and it's okay, but it's not going to make you a conversationalist overnight.
I'm reminded of someone I worked with once, a Brit, who thought it would be essential that he learn Afrikaans before emigrating to South Africa. He took lessons and was fluent (as a second language, anyway) but had the worst accent on the planet. It was hilarious to hear him speak grammatically correct Afrikaans with such a heinous accent.
Of course he landed in Cape Town and discovered that he had no need for Afrikaans at all.
Unless you pack up and move to a tiny Karoo town, you will be able to get by just fine speaking English. Your boyfriend's family may speak very broken English back to you, but chances are if you learned Afrikaans they'd still speak to you in broken English. I am bilingual but grew up speaking English and even though my Afrikaans is better than most Afrikaans peoples' English, if they notice one iota of an English lick in my accent, they will switch over to English. Afrikaans people are a lot more accommodating than Parisians.