[Elements vary by font and positioning]「Extra special power with emerging shaft」describes SEED DISPERSAL upon a climactic ejaculation that exceeds the ordinary scope in distance, volume, or some other defining characteristic.
　Nevertheless, there is another reason for「extra power within emerging shaft」and that is the increasing pressure building behind a URETHRAL BLOCKAGE: scarring from sexually transmitted diseases can cause both a shortened penis and a bent or curled penis, especially when attempting to become erect. This scarring can be removed somewhat by reaming the urethra with a long, thin rasp file, known as a BOUGIE. Gonorrhea and other such diseases cause scar tissue to form within the urethra. Procedures are generally unpleasant and involve involuntary spasmic movements, but removal of the scar tissue does get the fluids flowing once again, often with a forceful and abundant discharge upon first breakage.
　「Peyronie's Disease, …also known as 'Induratio penis plastica,' or more recently 'Chronic Inflammation of the Tunica Albuginea (CITA),' is a connective tissue disorder involving the growth of fibrous plaques in the soft tissue of the penis affecting up to 10% of men. Specifically, scar tissue forms in the tunica albuginea, the thick sheath of tissue surrounding the corpora cavernosa causing pain, abnormal curvature, erectile dysfunction, indentation, loss of girth and shortening. …The disease may cause pain. Hardened, big, cord-like lesions (scar tissue known as 'plaques'). Or abnormal curvature of the penis when erect due to chronic inflammation of the tunica albuginea (CITA). Although the popular conception of Peyronie's Disease is that it always involves curvature of the penis, the scar tissue sometimes causes divots or indentations rather than curvature. The condition may also make sexual intercourse painful and/or difficult…」
　　[　https://en.wikipedia.org/wiki/Peyronie%27s_disease 2012-08-15　]　

External source definitions
none located, and you ought to ask yourself, why not?
definition speculated from combining the elements, or, from usage in other glyphs