The second scene of Act III has two parts. In the first, Don Pedro and Claudio joke and tease Benedick about his changed condition; for Benedick now acts seriously and fails, for once, to say anything witty or clever. He tells his companions that he has a "toothache" (line 18). According to a Renaissance superstition, that was a sign that the person was in love. Pedro and Claudio also joke about Benedick's appearance. His pants are baggy and he is missing his doublet (a short jacket or vest), yet his hat looks brushed and he has shaved his beard. In addition, he is wearing perfume ("civet"). Benedict is so distracted by his love that he forgets to dress himself properly. Don Pedro makes a clever pun regarding the civet:
Can you smell him out by that? (42-43)
Literally, he is asking Claudio if he can smell the perfume. But metaphorically, to smell one out means to detect his secret. Pedro is asking Claudio if he knows Benedick's secret (that Benedick is in love). As he had predicted earlier, Benedick is being teased for being in love. Don Pedro makes another joke about Benedick after Claudio asserts that the woman who is in love with Benedick "dies for him" (56-57). Claudio means that she is quite ill because of her intense love for him. Don Pedro responds with the following line:
She shall be buried with her face upwards. (58)
During the Renaissance, the word die was also slang for having a sexual orgasm. Don Pedro's line implies that Beatrice will have sex with Benedick (she will be on her back -- "face upwards" -- and Benedick will be on top).
The most interesting aspect about this dialogue is that Benedick has not one witty response or clever remark. He has experienced a loss of wit. Love has turned him into an idiot. This concept still survives today, as it is commonly suggested in the expression "a fool for love."