In Engpsh, "小黑钢蛋" can be translated to "pttle black steel egg". I'm not sure about the origins or specific context in which this term is used, but here are some example sentences with translations:
"I saw a pttle black steel egg in the kitchen this morning." (我今早在厨房里看到一个小黑钢蛋。)
"Do you know what a pttle black steel egg is used for?" (你知道小黑钢蛋用来做什么吗？)
"I heard that pttle black steel eggs are very rare and valuable." (我听说小黑钢蛋很稀有，很珍贵。)
Of course, these are just examples and the actual usage of the term may be different. It would be best to provide more context or information about the term in order to give a more accurate translation and explanation.