The word for marriage and poison is the same: "gift" (pronounced with a short j sound, like "jet")

The word for strawberries is "jordgubbar", which directly translates to "dirt old men". "Jord" means dirt or the earth, and "gubbar" means old men.

Cockroach is "kackerlacka" which directly translates to "poop varnish" or "poop leak" ("kacka" is an old word for poop that's not used much anymore other than for this word, and "lacka" has several definitions).

The word for a kiss is "puss", and the word "Kiss" means pee. Some other words that sound weird/wrong and their definition:

Kock, means a chef.
Fart, means speed.
Prick, means dot.
Bra, means good.
Sex, means both sex and six.

And some weird and funny commonly used expressions:

"Glida in på en räkmacka" - To slide in on a shrimp sandwich. Is said when you're lucky or things are going well.

"Smaken är som baken: delad" - Taste is like the bum: split. Just means we all have different tastes in things and that's okay.

"Nu ska det bli andra bullar" - Now there will be other buns (buns like in cinnamon buns). Basically means that from now on there will be new, more strict rules and routines.

I could list many more but gotta head to bed. I can add more tomorrow if you want!