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スーパーで老夫婦が「激シコだねぇ……」というような会話をしてたのだが…
→ “An old couple at the supermarket was having a conversation like 'That's intense, isn't it?'...”
スーパー sū¹pā¹ = supermarket (noun)
で de = at / in (location particle)
老夫婦 rō¹fufu = old married couple (noun)
老 rō¹ = old / elderly
夫婦 fū¹fu = husband and wife
が ga = (subject marker particle)
「 = opening quotation mark (punctuation)
激シコ gekishiko = intense / hardcore (slang adjective)
激 geki = extreme / violent
シコ shiko = masturbation (slang)
だ da = is / to be (copula)
ねぇ nee = right? / isn't it? (sentence-ending particle)
」 = closing quotation mark (punctuation)
と to = said / that (quote particle)
いう iu = to say / call (verb)
よう yō¹ = like / as if (noun/adverbial form)
な na = (connective noun modifier)
会 kai = meeting / conversation (Kanji component)
話 wa = talk / story (Kanji component)
を o = (object marker particle)
し shi = do / make (verb stem)
て te = (conjunctional form of 'to do')
た ta = past tense marker
の no = (emphatic/narrative particle)
だ da = is / to be (copula)
が ga = but / however (contrastive particle)
… = ellipsis (punctuation)