An onomatopoeia and standalone word in its own right, uuueeeee is used to exclaim great pleasure, surprise or awe.
For creative purposes or to accentuate the excitibility of the moment, variable counts of both "U"s and "E"s are acceptable beyond the standard 3-to-5 ratio. Uuueeeee is a very organic word, and can be modified and even capitalized if the situation merits.
Example 1: Suck it babe uuueeeee!
Example 2: Oh Hellz Uuueeeee!
Example 3: Strongman, you are so strong! Uuuuueeeeeeeeee!