The act of sticking a digit into your female partners anus, while engaging in intercourse, in order to gauge that womans boundries or limitations concerning further action, up the old dirt road.
Clint: "Yo Dan, why you got a black eye man?"
Dan: "Yo, Michel socked me in the eye-face after I gave her a Rectal Thremometer. I guess I won't find out how pink her sock is."
Clint: "Awe fo' real doh?"
Dan: "Naw, billdo."
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