Internet Slang start's with J

J Joking

J/O Jack off

J2LYK Just To Let You Know

J4F Just For Fun

J4L Just for Laughs

JA Yes (German)

JACK OFF Masturbate

JACKWAGON Someone who messes things up

JAILBAIT Underage girl

JAILBREAK Crack an iPhone

JAJA Spanish laugh

JAM Just A Minute.

JAMBO Hello (Swahili)

JAND England (Nigerian)

JANK Worthless, useless

JAPAN Just Always Pray At Night

JARRIN Annoying

JAS Just A Second

JAT Just A Thought

JATQ Just Answer The Question

JAV Japanese Adult Video

JAVA Programming language
Coffee

JAWN Thing

JB Jail Bait
Jonas Brothers

JBF Just Been F***ed

JBH Just Being Honest

JC Jesus Christ
Just Curious
Just Chilling

JDI Just Do It

JDM Japanese Domestic Market

JEJE Hispanic LOL

JEJEMON People who type stupidly

JERK Idiot

JEST Joke

JEWFRO Curly Jewish hair style

JFC Jesus F***ing Christ

JFDI Just F***ing Do It

JFF Just For Fun

JFGI Just F***ing Google It

JFK John Fitzgerald Kennedy
New York airport
Just For Kicks

JFTR Just For The Record

JFYI Just For Your Information

JGH Just Got Home

JGI just google it

JGL Just Get Lost

JHC Jesus H Christ

JIC Just In Case

JIFFY Short period of time

JIMMY Penis

JIT Young gangster
Just In Time

JIZ Semen

JIZZ Semen

JJ Just Joking

JK Just Kidding

JKL Just Kidding Loser
Just Kidding, LOL

JKN Joking

JKS Jokes

JKZ Jokes

JLT Just like that

JLY Jesus Loves You

JLYK Just Letting You Know

JM Just Messing

JMHO Just My Humble Opinion

JML Just My Luck

JMO Just My Opinion

JMS Just Making Sure

JMT Just My Thoughts

JN Just Now

JO Yo

JODER Have sex

JOHN DOE General term for a man

JOINT Rolled marijuana cigarette

JONESING Craving, wanting really badly

JOOC Just Out Of Curiosity

JP Just Playin'

JPA Just Playing Around

JPEG Joint Photographic Experts Group
Image file format

JPG Image file format

JS Just Saying

JSMP Just S**t My Pants

JSU Just Shut Up

JSUK Just So You Know

JSYK Just So You Know

JTB Just Too Bad

JTFO Joked The F*** Out

JTLYK Just To let You Know

JTM Je t'aime (I love you)

JTTY Just To Tell You

JUAD Jumping Up And Down

JUGS Breasts

JUNK Rubbish
Male genitalia
Heroin

JUNKIE Addict

JUZ Just

JV Junior Varsity, amateur

JW Just Wondering

JWAS Just Wait And See

JWD Job Well Done

JWG Just a Wild Guess

JWTK Just Wanted To Know

JWTLYK just wanted to let you know

JWW Just Was Wondering

JYEAH Cool version of Yeah