Kočka

"Cat" in Czech language
Also is commonly used for complimenting girls, calling them "kočka" means they're pretty

Moje kočka mě škrábla. (My cat scratched me)
Hej holka! Ty seš ale kočka. (Hey girl! You're such a cat)

Pes

Mean "dog" in Czech and Slovak
Can be also used as an insult for someone who's pesimistic or avoid doing funny stuff

(Insult) Nebuď takovej pes (Don't be such a dog)

Hodný pes (Good dog)

Sorry jako

"Sorry jako" is invented by a "famous" politican Andrej Babiš. It can be used only in Czech and Slovak and it can be translated like "well sorry/sorry like/ sorry tho"
It becomed a meme on Czecho-Slovak internet and also in real life.

A proč bych vám já měl sdělovat všechny moje příjmy? Sorry jako.
- Andrej Babiš

Kurva

In Czech and Slovak( Also in Polish but with "w") usually used for calling womans who fucks for new iPhone or for money, or they fuck with other boys althought they already have a boyfriend, also can be used as word "fuck"

"Spí asi se třema chlapama, taková kurva" (She sleeps with like 3 guys, such a bitch)

"Kurva, spálilo mi to ruku, kurvaaaaa!!!" (Fuck, it burned my hand, fuuuuuuuck!!!)

Tsundere

Usually used in anime and manga.
Person(mostly female) who act violently,"cold" and sometimes a bit arogant to people they like or love, but in inside they're nice,caring and loving.

"I told her that she looks like a kitten, she asked "why?" i said "kittens are cute". She told me i'm idiot and walks away"
"Dude, she's such a tsundere..."

"I-t's not like i like you, or anything... B-Baka!"