Spelling: gumbel; gumbled; gumbeling; gumbler (one who gumbels).
Person B: Yup...
Person A: She almost noticed, too, because I stumbled over my words when she asked if I remembered her Aunt Lucy.
Person B: Her Aunt Lucy?
Person A: Yeah, thankfully I was able to divert the question and I got by.
Person B: Ah.
Person A: Are you gumbeling right now?
Person B: Of course not!
In this conversation, person A is telling about his experience gumbeling, while being gumbled himself. Person A is obviously still a novice, having tripped up in a gumbeling attempt, but person B is quite the expert, convincingly gumbeling and even managing to reassure the other that he is not being gumbled.