The slightly moist froth that builds up between a persons ass cheeks after prolonged physical activity on warm days. Ass Lather is usually accompanied by a foul stench. Similar to Swamp Balls.
Chad: Ah! Ah! Ah! Ah! Ah! Ah! Ah! Ah! Ah!
Kiersten : Ahhhh! Ahhhh! Ahhhh! Jesus Christ! Holy Shit! God Damn!
Chad : Ahhhhhhhhhhhhhh! Ahhhhhhhhhhhhhhhhh! Ahhhhhhhhhhhhhhhhh!
Kiersten : Wow that was some major cum looks like my sticky body's gonna need a shower!
Chad : Maybe I could join you and Lather your body!
Kiersten : Well the good thing is we can fuck in the shower and wash the cum right off!
Chad : I love to Lather you smooth body and fuck your soft pussy!
Kiersten : Oh Chad you are so sexual!
The lather effect is a drinking term that stems from a shampoo analogy. When you shampoo your hair the first time it takes a large palmful of shampoo to create a nice lather. However, after a quick rinse it merely takes a little drop to gain a full healthy lather. Similarly, if you drink hard the night before, it only takes a very small amount of booze to get you ripped the next morning.