Weeabitch
A weeaboo, typically female, who is rude to someone who is NOT Japanese. A bitchy weeaboo who may or may not be totally disgusting looking.
That girl just showed up at my party with a Japanese girl and didn't even introduce herself... what a weeabitch!
weeabitching
When a nerd complains about things (usually but not necessarily always involving Japan). Being butthurt over unimportant media-related events, products, news, updates, etc. Complaining loudly and/or for an extended period of time about said irrelevant things in person, on social media, etc.
They haven't stopped weeabitching about the Last Exile sequel since it came came out, claiming it's an insult to the original series.