There's a very good website that stilestastic recommended to me to use for trigedasleng. It's called trigedasleng dictionary and it has every episode from season 1+ listed. Every time someone speaks trigedasleng, someone translates it.
I also found some others that might be useful if you're using a Grounder OC, or just an OC who likes speaking trigedasleng.
I mean you no harm ; Ai nou na bash yo op
I'm trying to help! ; Ai's trana sis au!
Stop her! ; hod em op!
Blood must have blood ; jus drein jus daun
Blood must not have blood ; jus nou drein jus daun
Your fight is over ; yu gonplei ste odon
Stay strong ; ste yuj
I love you ; ai hod yu in
Don't worry ; nou trip raun, you
For the clothes ; hon in yong deyon, kapa
Goodbye ; leidon
Who are you? ; chon yu bilaik?
From water we are born, to water we return ; kom woda 'so gyon op, gon woda 'so kom daun
She's persistent, I'll give her that ; em laik fousen gougeda, you
Stay here ; kamp raun hir
Hey! ; dofo!
Damn it! : spichen!
Sky girl ; Skai Gada
Don't move ; nou step au
May we meet again ; mebi oso na hit choda op nodotaim
Love is weakness ; hodnes laik kwelnes
How are you? ; ha yu?
What's up? ; sochu?
I'm good ; ai ste os
Not bad ; nou foto
Death of a thousand cuts ; wamplei kom thauz kodon
I love you, too ; ai hod you in seintaim
My fight is never over ; ai gonplei nou ste odon nowe
I will be strong for my fight is not yet over ; ai na ste yuj kos ai gonplei nou ste odon kom nau
You are hurt ; yu ste laksen
I want to rip your fucking throat out ; ai gaf jok yu joken swela au
Fuck you ; jok of
Thank you ; mochof
Get knocked down, get back up ; ge smak daun, gyon op nodotaim
Let me go! ; klir ai of!
I owe you more than this ; ai ouyon yu klin kom mou kom dison
A drink ; souda
What the hell is that ; chon ona skafa daun?
You're lucky I didn't break your teeth ; yu's lottau ai nou don bos yu chopa op
He's an outcast ; du bilaik splita
I am a Sky-Person ; ai laik Skayon
You all will fight ; yo na gon raun
I want to rip your fucking throat out ; ai gaf jok yu joken swela au
I hope this helps!