You can remember the meaning of 反正 with this easy mnemonic:
I can't park at all, I'll have to go in reverse (反) and then go straight (正) forward again a few times in order to get it right. Anyway, now my husband drives so I don't have to worry about that anymore.
Using mnemonics to remember the meaning of Chinese characters like can have an enormous impact on how long to learn Mandarin it takes.