Being in the state of having a partially erect clitoris.
It was a Sunday afternoon and his lady wanted to do stuff so he began cunninglingus. However, he sucked at giving her oral favors so the best he could give her was a muffchub.
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Lady boner; female genitalia that has become aroused, possibly tingly or swollen.
When he whispered his dirty thoughts into her ear, she immediately got a muffchub.