Aswa’ [the verb]: said of men or otherwise when they have an erection and emit pre-ejaculate; said of a donkey when it thrusts its penis … A man can be told “ su’ su’ " [from the verb yasu’], as an admonishing to look out for his pre-ejaculate; a man “ aswa’ ” when he looks out for his pre-ejaculate … When camels “ tasu’ ” [when a camel “ yasu’ ”] it means they wander off without a herdsman.