Wiktionary
vb. (eye dialect of wondering English)
Wikipedia
Wonderin' is a tribute album featuring jazz-funk cover versions of Stevie Wonder songs. It was recorded by the ad hoc band Rollercoaster made up of leading UK session and jazz musicians from British jazz-rock bands of the 1960s and 1970s such as Soft Machine, Blue Mink and Nucleus.
It was released on Ronnie Scott's record label. Many of the Rollercoaster musicians later recorded the last Soft Machine album, Land of Cockayne, and make up Soft Machine's final live line-up which played a six-night residency at Ronnie Scott's in 1984.
Usage examples of "wonderin'".
God had told to man when the time had come, and the reverent soul below was ready to hear the low words whispered to his soul, and a wonderin' what strange revelation God held now, ready to reveal when the soul below had fitted itself to hear, and comprehend it.
I killed five poor devils when we attacked today, and afterwards I found meself wonderin' why.