A woman who seems to have a tendancy to soak up semen from all directions with no obvious limitation.
stop pestering, ive shagged you 15 times already and its nearly time for breakfast.. Go make me a full english you fucking sperm sponge..
Often a girl or woman that loves sucking and fucking men on a regular basis. Sometimes a homosexual male can also be refered as this.
Man, my ex-girlfriend is a total sperm sponge now.