Is it pee or is it not pee? The female ejaculation has inspired considerable research. So far, most scientists agree that they don't know enough. Most recorded case studies on the phenomenon were through Dr. Kinsey during his famous research. But many studies since have followed. There is some proof that the female ejaculate in some cases DOES contain a small amount or urine while there is also some proof that in other cases that female ejaculation contains NO urine. The only reasonable conclusion is that there are two types of female ejaculation. There is another physiological response to such stimulation called "urinary stress incontinence" in which something as profound as an extreme orgasm can force a sudden urination. When studying female ejaculation and urinary stress incontinence, several studies have shown that some women do both when they experience these especially great orgasms while other women have been observed to eject huge amounts of semen-like fluid (minus the sperm) that emitted from the vagina (not urethra) with no trace of urine or even signs of urinary action (a catheter was used to separate the urethra from the vagina). There have been very few if no reliable cases of women who orgasm and produce ONLY the urinary stress incontinence "spray." So either way, even though it is still not fully understood, it is the result of an extreme orgasm and at the very least, it is not JUST urine.
Some researchers believe that many more women are capable of such orgasms than have been studied and even some people theorize that ALL women are capable of achieving an ejaculation orgasm. This would be like comparing the average female orgasm with only working on one side of a Rubik's Cube while working out and completing the whole cube is similar to the "Big Orgasm." This theory suggests that all is required is the right combination of stimulations which many women have not discovered.
I am a squirter and can do it quite often and consistently. I believe that what you described was indeed a good old squirt. I think that's great! Congratulations.