1. When performing fellatio, licking or kissing up and down the shaft of the penis rather than taking the head in one's mouth; implies that the fellatio is unskilled, ignorant, or that the giver is bafflingly trying to perform "original" fellatio.
2. In music, when a musician or composer picks an unusual chord or phrase, in order to seem unique, when something simpler and more satisfying will do.
1. "I lost my hard-on because she was just corncobbing me."
2. "Why didn't he just play an E chord? He's just corncobbing."
The act of finding substitute material to be used in lieu of toilet paper, when the latter is unavailable. Refers to the historic usage of corncobs to maintain hygiene after defecation in rural areas in the United States, prior to the widespread availability of commercially manufactured toilet paper in the late 19th century.
The camping trip was pretty rough. We didn't bring enough TP, so after the first couple of days we were corncobbing it.