Glossary

A
aji - flavor / taste
anaru / anaru-fakku / anaru-sekkusu / AF - anal sex

B
bakku - "back," aka doggy style
bokki - erection / hard cock
bukkake - the sexual act of covering the girl's face in semen
burikko - a girl that acts cute, naive, and innocent

C
Cheri Boi - "Cherry Boy," a guy with little to no sexual experience / a male virgin
chi-chi - breasts / tits
chikubi - nipple
chin-chin - cock / dick
chinpo - cock / dick

D
dekachin - big dick
di-pukisu - "deep kissing" / French kissing / making-out

E
ecchi - sex
eki-ben - a standing face-to-face sexual position where the guy is completely carrying the girl.  Named so as it resembles a person selling "eki-bento" lunches at the train station.
eroi - erotic / hot / sexy

F
fera - short for "fellatio," aka blowjob

G
gaijin / gaikokujin - foreigner
gaman - to endure / tolerate, as in to hold back from cumming
gokkun - cum swallowing
gomu - condom / rubber
gomu-nashi - bareback / no condom

H
hadaka - naked
hageshii - hard / intense
hajimete - first time
hakujin - a white person
hassha - ejaculation, literally "firing" or "shooting"
hazukashii - embarrassed / shy
honto? - really?

I
iku - to cum / ejaculate
irete (kudasai) - put (it) in, insert

K
kawaii - cute
kakkoii - cool / handsome
kao-dashi - cum on face
karami - a sex session
kijyoui - cowgirl position
kimochiii - feels good
kintama - balls, literally "gold balls"
kirei - beautiful
kisu - kiss
kitsuman - tight pussy
koufun - turned on, excited, stimulated
kuchi - mouth
kuchi-dashi - cum in mouth
kunni - short for "cunnilingus"
kuri - short for "clitoris"

M
manko - pussy
manpe - queef / pussy fart
mousou - to fantasize
mune - chest
mura-mura - to get turned on, horny

N
naka-dashi - cumming inside / creampie
nama / nama-ecchi - bareback sex
ne-bakku - prone bone / flat doggie style position
netorare - cuckolding (often abbreviated "NTR")

O
onani - masturbation / touching oneself
ooi - a large amount / much / many
ookii - big
oppai - breasts
oshiri - ass / rear-end

P
paipan - shaved, as in a shaved pussy
paizuri - titty fuck
pero-pero shite - lick it

R
rezu - lesbian sex

S
san-pi / 3P - threesome / group sex
seijyoui - missionary position
seishi - sperm
sekkusu - sex
semai - tight / narrow, as in a tight pussy
shimari ga ii - "good tightness" = tight pussy
shiofuki - squirting / female ejaculation
sourou - premature ejaculation / "quickie"
sugoi - great
suki (desu) - to like (something)

T
tachi-bakku - standing doggy style
tanima - "valley," refers to a woman's cleavage
tekoki - hand job
tsuyoi - strong

Y
yabai - cool / crazy / oh shit! / oh wow!  *Similar to "fuck" in English, this expression has both good or bad meanings depending on context.*
yasashii - kind / nice

Z
zengi - foreplay