welding
grinding your penis in between the thighs of another man to achieve ejaculation.
In the mid-90s, young men at the Indian Institute of Technology (IIT-Madras) started the concept of welding as they were having difficulty getting anywhere with young females.

Sanju: Man, I asked the hot chick out to chai, but she rejected me.

Krishnu: It's okay. We can head back to our dormitories and weld Sanju.