Kimoi - This word literally means "disgusting". Kogals use it describe guys that they do not like.
Gangire - This means "really upset" or "just about to get so mad"
Maji - "Really?"
Maji-mukatsuku - "That really makes me mad" or "I hate that"
Pakuru - To steal
Chikuru - To tell on someone
All (pronounced "o-ru" in Japanese) - Staying up late or all night
Enjo, enkou - Prostitution or dating older men for money (from the word "enjo-kosai")
Geki-kawa - Really cute
Tenparu - To try to hurry
Kinpa - Bleached or dyed blond hair
Yabai - Dangerous
Owatta - Literally "It's over". Some girls, however, use it when they don't like a situation.
Ikemen - A good looking guy
Loose (pronounced "ru-zu" in Japanese) - Abbreviation for "loose socks", the ones used by schoolgirls in Japan.
Cho - Extremely. Girls use this word before another word, such as "Cho-kakkoii" (That's really cool)
Puri-cho - A notebook for sticking purikura (tiny sticker-pictures with frames around them). Taking these pictures even among adults is common, especially when they are with friends
Uchi-me - Myself ("uchira" means "us")
~makuru - To do something a lot (e.g., "asobi-makuru" means "to hang around a lot" or to "party a lot")
Nanpa - To ask a woman on the street for a date. This is a fairly common practice among young people in Japan especially in areas with a lot of nightlife. When groups of young men and women are hanging out, men will typically shout it to a group of girls or vice versa. (Warning: If you are a foreigner, do not try it)
Gyaku-nan - To ask a man on the street for a date (Short for "gyaku-nanpa" which means "opposite of nanpa")
Karui- A guy or a girl that hangs around a lot, sometimes at night and has lots of girlfriends or boyfriends. using http://www.freedict.com/onldict/onldict.p
Asondesou -Another word for "karui"
Ikebu - Ikebukuro
Uzaberu - pocket bell
Kimpa - blonde hair
Keita - cellular phone
Kerompa - Blonde long haired man
Sonipura - Sony Plaza
Tawareko - Tower records
Cho LL - Super-love love
Choyagamo - Get damaged
Cho YM - Overly highly motivated
Choberigu - Super very good
Choberiha - Super very Happy
Choberibu - Super very blue
No pro - no problem
Naru Ra - Narcissisit
B.A - A bad attitude
Pitch - PHS
Buya - Shibuya
Famima - Family mart
V - Fan of v6
Bukuro - Ikebukuro
Pongi - Roppongi
Ronge - long hair
Wakattingu - meaning of understanding
Chokomba - are very out of condition
CB - awkward person
Amura - Girl who is conscious of Namie Amuro
some other words my friend taught me that might apply to GAL language:
busaiku - ugly
debu - fat
kowai - scary
kawai - cute