"Slang" speak has become so common these days, I can nearly classify it as our second language.
Here is a more "fluent" version of your speech:
W#1 - Yo dude i banged the shinzit out of a bitch.
WG#2 - Did you toss that hot saladsizzle?
WG#1 - Ya homie, I rimmed her summin' fierce!
WG#2 - Dude, hookafizzle mezizzle withazizzle hotazizzle bitcharooni!
Kimi wa ne tashika ni ano toki watashi no soba ni ita
Itsudatte itsudatte itsudatte
Sugu yoko de waratteita
Nakushitemo torimodosu kimi wo
I will never leave you