Snail tracks refers to the natural lubrication of the vagina when a woman is excited. A snail leaves a slime track, and this is attributed to a woman who is horny and sitting down.
The act of seeking and tracking poon for one's bro, so the bro can engage in coitus with said poon. Poon tracking can involve gaining information, following and stalking said poon so his bro has the best chance in succeeding of getting the poon.