According to these sites and some dictionaries, https://masterlanguage.net/word/5134.html#i-2 https://peta-eri.com/suck meaning of "suck"①：verb (BE BAD) mainly US slang If someone or something sucks, that person or thing is bad or unpleasant (Cambridge Dictionary) 最低だ／最悪だ／酷い／最悪／最悪だよ／困った／げっ／まずい　← it sucks. meaning of "suck"②： When you are bad at doing something. (Urban Dictionary) 苦手なんだ／下手なんだ／下手すぎ／駄目だ meaning of "suck"③：disappointing 残念だ／駄目だ／つまんない／無理　← it sucks. meaning of "suck"④：(who) makes sweet talk/having a flattering tongue おべっか使い／腰巾着 ／へつらっている／こびへつらっている／ゴマすり／ご機嫌取り