"When I was a child, my blind mother taught me hand jobs, like carpentry and painting with her legs."
Blind Mother's Lessons
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke here plays on the double meaning of "hand job." It's supposed to mean a skill done by hand, like carpentry, but it also means something naughty. The speaker then adds that their blind mom taught them using her legs which is not how things are normally done, because the speaker isn't very smart.