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Muffing is a penetration technique enjoyed by some non-op trans women. It involves fingering (or otherwise penetrating) the inguinal canals, the canals through which the testes drop during puberty. […] Sometimes the testes are pushed back up into the body during muffing, and sometimes they're simply moved aside […]
Source: wiktionary
[…] she says she and her partner were having a great time last night and she really enjoyed the muffing.