Like us on Facebook, follow us on Twitter! Celebrate another year with MH and read our yearbook.
Manga News: Check out this week's new manga (9/8/14 - 9/14/14).
Forum News: Visit new sections for Nisekoi and Kingdom!
The 『あ』 holds no particular meaning. And 『どっせい』 is a kind of a call/shout, just like "Wasshoi".
Hope this helps...
It helped a lot.