j-in
Or variations like: J,Jay-in,J-en,J-in-it,Jayen Jayin or J-in-off,J-ed(past tense)  sometimes be confused with names Jayne, Jay, Jade, or Jason. A derivative / abbreviation for the present tense phase "jacking off" or "jerking off", which is slang for masturbation.  Similar to the abbreviations: HJ,BJ,FJ or ZJ.   The letter "J" when used alone can be short for "Jizz" or seamen,  or in proper context (along with J-ed) can be the past tense of "jacking off".    
" Hey, sorry I did not answer I was totally j-in when you called'
" Yea, I had to bust out a quick safety J in the bathroom the flying J"
" I J-ed like six times last night"
" I got J all over her"
" I J-ed all over her"
