Someone asked me this on minecraft because I can't read kana, so I was just typing in romaji. I thought it meant like "you know romaji?" Or something like that but I'm not sure, since I couldn't find anything specific on the Internet.
What does romaji wakaruno mean?
Marlin 30.10.2015
It means "Do/Can you understand (this)?".
Wakaru = to understand
No = used to ask informal questions
Sasoriza 30.10.2015
(hiragana: romaji: "wakaru") : 'to understand', 'to tell', 'to distinguish', 'to recognize', 'to realize'
(romaji: "no") : particle
Erik Van Thienen 30.10.2015
"Romaji wakaru no" means "Do you understand romaji?" (i.e. Japanese written in latin letters).
Himatsubushi 30.10.2015