Green’s Dictionary of Slang

(US black) semen.

1972		B. Rodgers Queens’ Vernacular 213: whipped cream nocturnal emission.
1978		L. Kramer Faggots 87: [He] finished himself off with his own hand, directing his own whipped cream to make the dessert before them even classier.
1980		E. Folb Runnin’ Down Some Lines 260: whip(ped) cream Semen.