I don't know the range of your vocabulary. Language professionals say Trump speaks at a fourth grade level of vocabulary and that's what I reported.
"Schmuck or shmuck in American English is a pejorative meaning one who is stupid or foolish; or an obnoxious, contemptible or detestable person. The word entered English from Yiddish (שמאָק, shmok), where it has similar pejorative meanings, but its original meaning in Yiddish is penis.
Because of its vulgarity, the word is euphemized as schmoe, which was the source of Al Capp's cartoon strip creature the shmoo.
Variants include schmo and shmo. In Jewish homes, the word was "regarded as so vulgar as to be taboo".
Lenny Bruce, a Jewish standup comedian, wrote that the use of the word during his performances in 1962 led to his arrest on the West Coast "by a Yiddish undercover agent who had been placed in the club several nights running to determine if [his] use of Yiddish terms was a cover for profanity"."
“Schmuck or shmuck in American English is a pejorative meaning one who is stupid or foolish; or an obnoxious, contemptible or detestable person.”
The above is the common usage definition that I have heard used all my life. Schmuck is used frequently by both Jewish and non-Jewish folks, myself included, and by many of my friends. None of us are thinking “penis” when we use this word. Come down off your linguistic high horse and join the rest of us here in the gutter. We have more fun.
...Proud profane schmuck!