There are numerous euphemistic synonyms that can be used for the phrase "hast sexual intercourse." Some of these include "made love," "had sex," "engaged in sexual activity," "hooked up," "got intimate," "copulated," "slept together," "had relations," "shared a bed," "made whoopee," and "got it on." These phrases are often used in place of direct and explicit language to describe sexual activity, particularly in polite or more formal settings. However, it is important to note that different cultural and linguistic contexts may impact the use and meaning of these synonyms.