Chinese for a egg (son) of a turtle; similar to SOB but with a slightly longer history. Origins vary, but the most popular theory is that comes from wang ba duan (忘八端), which means forgetting filial piety, 'brotherly respect', loyalty, trustworthiness, politeness, justice, honesty and shame. (Being ashamed means you know you did something wrong. Calling someone shameless can be highly offensive.) Incidentally, apart from turtle, wang ba also means someone who wears a green hat.

Though if you're looking for a Chinese translation of SOB, there are better equivalents.

the thing that you don’t have when you’re phones percentage is over 20

The exact translation is "Stupid son of a turtle", and it is written as "愚蠢的龟儿子" in simplified Chinese. Equivalent in offensiveness to "stupid son of a bitch" in english