Green’s Dictionary of Slang

jizz v.

also jiss, jizz up
[jism n.]

(orig. US) to ejaculate, esp. in context of masturbation; thus jizzed out, sexually exhausted.

[US]B. Rodgers Queens’ Vernacular 53: to experience an orgasm [...] jizz (late ’50s).
[US](con. 1940s) E. Thompson Tattoo (1977) 25: JISS ME, DADDY!
[US]Frank Zappa ‘Drop Dead’ 🎵 Jizzing all over yourself in your leather cocksucker costume.
[US]‘Bill E. Goodhead’ Nubile Treat 🌐 At last her body was still, and his dick quit jizzing.
[UK]M. Manning Get Your Cock Out 36: The thought crossed Mincey’s mind that the coke might render him unable to jizz.
[US]J. Ellroy ‘Hot-Prowl Rape-O’ in Destination: Morgue! (2004) 314: His boner bounced. He grimaced and jizzed up his jeans.
M. Rowson on Twitter 13 Apr. 🌐 I see the whining fascist bedwetters at @LeaveEUOfficial are jizzing themselves into a frenzy with excitement at the BBC's ‘daring’ at getting the actor who played Star War's Emperor Palpatine to read out Enoch Powell's ‘Rivers of Blood’ speech. Christ, but these wankers need to get out more.
[US]N. Walker Cherry 21: A song about making all the females crawl on the floor and jizzing on the females and stuff.
[US](con. 1962) J. Ellroy Enchanters 251: I saw hurled furniture and jizzed-up lingerie.

In derivatives

jizzer (n.)

1. an ejaculator.

[UK]M. Manning Get Your Cock Out 107: Mincey was the most copious jizzer she’d ever seen.
www.datehookup.com 30 July 🌐 I seriously just gave it a light touch to see if he was a shower or a grower and I found out real quick he was just a jizzer.

2. (Ulster) a masturbator.

forums.boards.mpora.com 10 June 🌐 A Jizzer is an Northern Irishism for w**ker.

3. an ejaculation (usu. in a pornographic movie).

http://gay.avn.com 1 Apr. 🌐 This is more than Inches Away from being a hot video. A good example is Jesse Skylar, who has to do his jizzer standing behind and away from partner Joey Carr after their ‘hot’ sex session.
‘Slang of Pornography’www.literotica.com 6 July 🌐 Jizzer— A shot in a movie where the male ejaculated outside his partner’s body. Also called a cum-shot.
E. Lee Header 2 at www.edwardleeonline.com 🌐 Boy, I know full well you can shoot a jizzer farther than most fellas but—shee-it!—you’re standin’ six feet away! Ain’t no man can belt a load six fuckin’ feet!
http://gay.pornfinder.tv/norm/jizzer.html 🌐 Edgin out a huge jizzer smokin. Volcano Jizzer. Panty jizzer.

4. the penis in the context of ejaculation.

www.darkwanderer.net 23 Mar. 🌐 The on-set fluffer had sucked his jizzer to the bursting point.
collegedudes.com 12 Apr. 🌐 Glorious cock on Ty and what a jizzer! Ian is so fuckable.
www.4tube.com 14 Feb. 🌐 Watch Randy Riley Ray eases the juice from a jizzer and other porn videos.
www.clickcuties.com 🌐 Horny blonde nymphet shagging a jizzer.

5. a female who ‘ejaculates" during intercourse.

www.giantbomb.com 4 Oct. 🌐 Girls can jizz? How do you know that Hannah Montana's a jizzer? Also, where's Stroker? Girls all across the world jizz when they see Stroker.
itsyowyow.com 24 Oct. 🌐 She is a self-described as a ‘jizz master’ and has been described by Helmut Newton as a ‘jizzer of the highest order’.