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1.
A nickname for a "villain" in the manga/anime Bleach, Ulquiorra Schiffer. It's a way of calling Ulquiorra cute and needy, like certain animes depict ukes. It is rarely used as an insult, and tends to be used by fangirls.
On a Bleach fanforum:

girl49370: I drew a picture of Ukelala in a bunny outfit!

girl2: Awww! So cute!
by emmalinell April 27, 2009