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To jam, or to jamalam. Relieving your self on a girls face e.g cumming in the eye or mouth.
Jamming on face

'Josh says to Gemma, Gemma get on your knees bitch i'm gonna jam on your face, yeh that's wot i fout bitch.'

'Yesterday i was like jamming on her face and now she ait my ting'.
by cat22546387 January 07, 2011