on the blob

== English == === Etymology === (menstruating): Apparently a reference to the blobbing (i.e. dripping) of menstrual blood, likely following the model of on the rag. === Prepositional phrase === on the blob (British, slang, vulgar) Menstruating; on one's period. Synonym: on the rag (UK, slang, obsolete) Of begging etc.: performed by speaking to people, not by writing letters.