From the Super Mario Wiki

"The device is compatible with the Game Boy Advance SP, however, it doesn't mount flush." What??? I've never heard something this awkward. What is it supposed to mean? --Mariofan5000 (talk) 12:12, 4 January 2014 (EST)

There's an image caption describing it. I think you could use that. BabyLuigiFire.png(T|C) 12:14, 4 January 2014 (EST)
Stop acting so rude, Baby Luigi. Anyway, I suppose it means it doesn't mount "cleanly"... I think that's a more precise term, but I don't want to risk the intended meaning with a less technical-sounding word.
Mario Green.pngKaBoom! 14:23, 4 January 2014 (EST)
Huh? I wasn't trying to come off as rude here :/ BabyLuigiFire.png(T|C) 14:42, 4 January 2014 (EST)