What are the…
This is a name for people who imitated the licentious wickedness of Sodom (Deuteronomy 23:17; 1 Kings 14:24; 15:12; Romans 1:26, 27).
Asa destroyed them “out of the land” (1 Kings 15:12), as did also his son Jehoshaphat (22:46; 23:7)
The sin of sodomy, or homosexuality, was considered normal behavior in the pagan nations of Canaan which the Lord had commanded the Israelites to destroy. To God, however, it was one of the most grievous of their “abominations.” …[In Genesis 18:20 we see that] the iniquity of the Amorites was not yet full (Genesis 15:16), but these cities of the plain [Sodom and Gomorrah] had reached God’s limit, especially in view of their reversion to gross wickedness after the marvelous deliverance God gave them through Abraham and after seeing and hearing the testimony of Melchizedek, and even the witness of Lot… The enormity of Sodom's wickedness is indicated by the eagerness with which not a few degenerates, but all the men (Genesis 19:4) of the city desired to commit the crime of homosexual rape, probably leading to murder, on two unknown visitors to their city. Lot's desire to protect them demonstrates his basically godly character (2 Peter 2:8) even though his carnality had led him into this compromising association.
Solomon had allowed it and other immoral practices to reenter the land as a result of his marrying wives from these nations. (Dr. Henry M. Morris, The Defender's Bible)
Jude 1:7 explains that “even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire” (KJV).
“The inhabitants of Sodom and Gomorrah became obsessed with sexual promiscuity, worst of all ‘going after strange flesh’—that is, blatant indulgence in the unnatural crime of homosexuality, including homosexual rape of visiting strangers (Genesis 19:4-9). The phrase ‘in like manner,’ indicates that the sin of the [fallen] angels was in the same category as that of the Sodomites. …The cities were destroyed by fire (Genesis 19:28), but its wicked inhabitants will continue to exist in everlasting fire (Matthew 25:41).” —Dr. Henry M. Morris, The Defender's Bible