When I was in graduate school, a professor, knowing that I had a good grip on electronics, unliike most mechanical and aerospace engineers, asked me to look in on a doctoral candidate to see if I could jumpstart his research project. The candidate had been working for nearly a year, had a 10 x 10 foot room crammed full of electronic instrumentation, and not only had not obtained an iota of data, but could not even integrate his instrumentation.
I discretely inquired of the candidate his objective and plan of attack, then reviewed his instrumentation, and retired to my office and gave the project my consideration. I knew I could get his instrumentation to work, but decided his plan was too complex and resolved to do it my way.
I designed a miniature probe to fit inside the wind tunnel where the data was to be collected, then with my probe, a 12 volt dry cell, and a vacuum tube volt meter, the candidate had all the data on which to base his doctoral dissertation, in two weeks time!
Soon the entire faculty and grad student body of the Mechanical and Aerospace Engineering Department was buzzing about the "slick" probe I invented. It wasn't long after that, other grad students began calling me "Slick".
After graduation, I thought I had left the nickname behind, but one day a work associate told me of a problem he was wrestling with. I proposed a solution, and my associate, after reflecting on my idea, said "Wow! That is slick!. I said, "Yeah, they used to call me Slick because I often came up with things like that."
After that, this associate always called me Slick and it got started again.
Fast forward 30 years to the internet. I tried using slick for a user ID but soon found it was usually taken. So, I had to tweak it, but tagging on my birth year seemed too trite. I came up with texasSlick to show my Texas pride, and the format (lower case leading word, next word with initial letter in upper case and no space between) was typical of computer code writers (at that time, I was engaged in a lot of code writing).
Now a days, most folks think it alludes to my bald head, but I don't mind.
Slick