From Wiktionary, the free dictionary
Literally, “to go under the desk”.
- IPA(key): /pa.se su l(ə) by.ʁo/ ~ /pɑ.se su l(ə) by.ʁo/
passer sous le bureau
- (informal) to perform fellatio (in exchange for some academic or professional benefit)
- Synonym: passer sous la table