A double diddle is when two men rub the tips of their penises together, usually fast and sometimes violently.
by Horse_Fondler November 15, 2017
To masturbate with both hands.
"I asked her to send me a pic where she's diddling herself, and she told me she wouldn't have a free hand."
" Oh, she must double diddle."
" Oh, she must double diddle."
by sangreazul March 18, 2016