Blumming is a slang term used for a dry orgasm by men suffering from retrograde ejaculation.
This condition causes the sperm to end up in the bladder, which is why the term of cumming, cum, becomes blumming or blum
The act of sucking out a females ovaries through oral sex and then redistributing them into the woman's mouth with yours. Sometimes this occurs by force.
Curran: Hey, Deepti, you wanna get a good blumming?
Deepti: No thanks, I'm too much of a bitch for that.
The act practiced by squaddies in the presence of a camera & an unaware victim.
Victim is usually busy manning a phone or working on equipment, camera is filming said victim (either knowingly or non), victim is approached by the "air bummer", "air bummer" begins simulating sex motions without touching or alerting the victim that they are being "air bummed", hilarity ensues, victim humiliated, video is usually posted on the internet.
In extreme cases the "air bummer" will be joined by multiple wingmen and all will start bumming each other, sometimes forming a "bumming train".
Bestairbumming examples are found on well known video websites.